diff --git a/Include/datetime.h b/Include/datetime.h
new file mode 100644
index 0000000..7bfbf0b
--- /dev/null
+++ b/Include/datetime.h
@@ -0,0 +1,125 @@
+/*  datetime.h
+ */
+
+#ifndef DATETIME_H
+#define DATETIME_H
+
+/* Fields are packed into successive bytes, each viewed as unsigned and
+ * big-endian, unless otherwise noted:
+ *
+ * byte offset
+ *  0 		year     2 bytes, 1-9999
+ *  2		month    1 byte, 1-12
+ *  3 		day      1 byte, 1-31
+ *  4		hour     1 byte, 0-23
+ *  5 		minute   1 byte, 0-59
+ *  6 		second   1 byte, 0-59
+ *  7 		usecond  3 bytes, 0-999999
+ * 10
+ */
+
+/* # of bytes for year, month, and day. */
+#define _PyDateTime_DATE_DATASIZE 4
+
+/* # of bytes for hour, minute, second, and usecond. */
+#define _PyDateTime_TIME_DATASIZE 6
+
+/* # of bytes for year, month, day, hour, minute, second, and usecond. */
+#define _PyDateTime_DATETIME_DATASIZE 10
+
+typedef struct
+{
+	PyObject_HEAD
+	long hashcode;
+	unsigned char data[_PyDateTime_DATE_DATASIZE];
+} PyDateTime_Date;
+
+typedef struct
+{
+	PyObject_HEAD
+	long hashcode;
+	unsigned char data[_PyDateTime_DATETIME_DATASIZE];
+} PyDateTime_DateTime;
+
+typedef struct
+{
+	PyObject_HEAD
+	long hashcode;
+	unsigned char data[_PyDateTime_DATETIME_DATASIZE];
+	PyObject *tzinfo;
+} PyDateTime_DateTimeTZ;
+
+typedef struct
+{
+	PyObject_HEAD
+	long hashcode;
+	unsigned char data[_PyDateTime_TIME_DATASIZE];
+} PyDateTime_Time;
+
+typedef struct
+{
+	PyObject_HEAD
+	long hashcode;
+	unsigned char data[_PyDateTime_TIME_DATASIZE];
+	PyObject *tzinfo;
+} PyDateTime_TimeTZ;
+
+typedef struct
+{
+	PyObject_HEAD
+	long hashcode;		/* -1 when unknown */
+	int days;		/* -MAX_DELTA_DAYS <= days <= MAX_DELTA_DAYS */
+	int seconds;		/* 0 <= seconds < 24*3600 is invariant */
+	int microseconds;	/* 0 <= microseconds < 1000000 is invariant */
+} PyDateTime_Delta;
+
+typedef struct
+{
+	PyObject_HEAD		/* a pure abstract base clase */
+} PyDateTime_TZInfo;
+
+/* Apply for date, datetime, and datetimetz instances. */
+#define PyDateTime_GET_YEAR(o)     ((((PyDateTime_Date*)o)->data[0] << 8) | \
+                                     ((PyDateTime_Date*)o)->data[1])
+#define PyDateTime_GET_MONTH(o)    (((PyDateTime_Date*)o)->data[2])
+#define PyDateTime_GET_DAY(o)      (((PyDateTime_Date*)o)->data[3])
+
+#define PyDateTime_DATE_GET_HOUR(o)        (((PyDateTime_DateTime*)o)->data[4])
+#define PyDateTime_DATE_GET_MINUTE(o)      (((PyDateTime_DateTime*)o)->data[5])
+#define PyDateTime_DATE_GET_SECOND(o)      (((PyDateTime_DateTime*)o)->data[6])
+#define PyDateTime_DATE_GET_MICROSECOND(o) 		\
+	((((PyDateTime_DateTime*)o)->data[7] << 16) |	\
+         (((PyDateTime_DateTime*)o)->data[8] << 8)  |	\
+          ((PyDateTime_DateTime*)o)->data[9])
+
+/* Apply for time and timetz instances. */
+#define PyDateTime_TIME_GET_HOUR(o)        (((PyDateTime_Time*)o)->data[0])
+#define PyDateTime_TIME_GET_MINUTE(o)      (((PyDateTime_Time*)o)->data[1])
+#define PyDateTime_TIME_GET_SECOND(o)      (((PyDateTime_Time*)o)->data[2])
+#define PyDateTime_TIME_GET_MICROSECOND(o) 		\
+	((((PyDateTime_Time*)o)->data[3] << 16) |	\
+         (((PyDateTime_Time*)o)->data[4] << 8)  |	\
+          ((PyDateTime_Time*)o)->data[5])
+
+#define PyDate_Check(op) PyObject_TypeCheck(op, &PyDateTime_DateType)
+#define PyDate_CheckExact(op) ((op)->ob_type == &PyDateTime_DateType)
+
+#define PyDateTime_Check(op) PyObject_TypeCheck(op, &PyDateTime_DateTimeType)
+#define PyDateTime_CheckExact(op) ((op)->ob_type == &PyDateTime_DateTimeType)
+
+#define PyDateTimeTZ_Check(op) PyObject_TypeCheck(op, &PyDateTime_DateTimeTZType)
+#define PyDateTimeTZ_CheckExact(op) ((op)->ob_type == &PyDateTime_DateTimeTZType)
+
+#define PyTime_Check(op) PyObject_TypeCheck(op, &PyDateTime_TimeType)
+#define PyTime_CheckExact(op) ((op)->ob_type == &PyDateTime_TimeType)
+
+#define PyTimeTZ_Check(op) PyObject_TypeCheck(op, &PyDateTime_TimeTZType)
+#define PyTimeTZ_CheckExact(op) ((op)->ob_type == &PyDateTime_TimeTZType)
+
+#define PyDelta_Check(op) PyObject_TypeCheck(op, &PyDateTime_DeltaType)
+#define PyDelta_CheckExact(op) ((op)->ob_type == &PyDateTime_DeltaType)
+
+#define PyTZInfo_Check(op) PyObject_TypeCheck(op, &PyDateTime_TZInfoType)
+#define PyTZInfo_CheckExact(op) ((op)->ob_type == &PyDateTime_TZInfoType)
+
+#endif
diff --git a/Lib/test/test_datetime.py b/Lib/test/test_datetime.py
new file mode 100644
index 0000000..058fb90
--- /dev/null
+++ b/Lib/test/test_datetime.py
@@ -0,0 +1,2128 @@
+"""Test date/time type."""
+
+import sys
+import unittest
+
+from test import test_support
+
+from datetime import MINYEAR, MAXYEAR
+from datetime import timedelta
+from datetime import tzinfo
+from datetime import time, timetz
+from datetime import date, datetime, datetimetz
+
+#############################################################################
+# module tests
+
+class TestModule(unittest.TestCase):
+
+    def test_constants(self):
+        import datetime
+        self.assertEqual(datetime.MINYEAR, 1)
+        self.assertEqual(datetime.MAXYEAR, 9999)
+
+#############################################################################
+# tzinfo tests
+
+class FixedOffset(tzinfo):
+    def __init__(self, offset, name, dstoffset=42):
+        self.__offset = offset
+        self.__name = name
+        self.__dstoffset = dstoffset
+    def __repr__(self):
+        return self.__name.lower()
+    def utcoffset(self, dt):
+        return self.__offset
+    def tzname(self, dt):
+        return self.__name
+    def dst(self, dt):
+        return self.__dstoffset
+
+class TestTZInfo(unittest.TestCase):
+
+    def test_non_abstractness(self):
+        # In order to allow subclasses to get pickled, the C implementation
+        # wasn't able to get away with having __init__ raise
+        # NotImplementedError.
+        useless = tzinfo()
+        dt = datetime.max
+        self.assertRaises(NotImplementedError, useless.tzname, dt)
+        self.assertRaises(NotImplementedError, useless.utcoffset, dt)
+        self.assertRaises(NotImplementedError, useless.dst, dt)
+
+    def test_subclass_must_override(self):
+        class NotEnough(tzinfo):
+            def __init__(self, offset, name):
+                self.__offset = offset
+                self.__name = name
+        self.failUnless(issubclass(NotEnough, tzinfo))
+        ne = NotEnough(3, "NotByALongShot")
+        self.failUnless(isinstance(ne, tzinfo))
+
+        dt = datetime.now()
+        self.assertRaises(NotImplementedError, ne.tzname, dt)
+        self.assertRaises(NotImplementedError, ne.utcoffset, dt)
+        self.assertRaises(NotImplementedError, ne.dst, dt)
+
+    def test_normal(self):
+        fo = FixedOffset(3, "Three")
+        self.failUnless(isinstance(fo, tzinfo))
+        for dt in datetime.now(), None:
+            self.assertEqual(fo.utcoffset(dt), 3)
+            self.assertEqual(fo.tzname(dt), "Three")
+            self.assertEqual(fo.dst(dt), 42)
+
+    def test_pickling_base(self):
+        import pickle, cPickle
+
+        # There's no point to pickling tzinfo objects on their own (they
+        # carry no data), but they need to be picklable anyway else
+        # concrete subclasses can't be pickled.
+        orig = tzinfo.__new__(tzinfo)
+        self.failUnless(type(orig) is tzinfo)
+        for pickler in pickle, cPickle:
+            for binary in 0, 1:
+                green = pickler.dumps(orig, binary)
+                derived = pickler.loads(green)
+                self.failUnless(type(derived) is tzinfo)
+
+    def test_pickling_subclass(self):
+        import pickle, cPickle
+
+        # Make sure we can pickle/unpickle an instance of a subclass.
+        orig = FixedOffset(-300, 'cookie')
+        self.failUnless(isinstance(orig, tzinfo))
+        self.failUnless(type(orig) is FixedOffset)
+        self.assertEqual(orig.utcoffset(None), -300)
+        self.assertEqual(orig.tzname(None), 'cookie')
+        for pickler in pickle, cPickle:
+            for binary in 0, 1:
+                green = pickler.dumps(orig, binary)
+                derived = pickler.loads(green)
+                self.failUnless(isinstance(derived, tzinfo))
+                self.failUnless(type(derived) is FixedOffset)
+                self.assertEqual(derived.utcoffset(None), -300)
+                self.assertEqual(derived.tzname(None), 'cookie')
+
+#############################################################################
+# timedelta tests
+
+class TestTimeDelta(unittest.TestCase):
+
+    def test_constructor(self):
+        eq = self.assertEqual
+        td = timedelta
+
+        # Check keyword args to constructor
+        eq(td(), td(weeks=0, days=0, hours=0, minutes=0, seconds=0,
+                    milliseconds=0, microseconds=0))
+        eq(td(1), td(days=1))
+        eq(td(0, 1), td(seconds=1))
+        eq(td(0, 0, 1), td(microseconds=1))
+        eq(td(weeks=1), td(days=7))
+        eq(td(days=1), td(hours=24))
+        eq(td(hours=1), td(minutes=60))
+        eq(td(minutes=1), td(seconds=60))
+        eq(td(seconds=1), td(milliseconds=1000))
+        eq(td(milliseconds=1), td(microseconds=1000))
+
+        # Check float args to constructor
+        eq(td(weeks=1.0/7), td(days=1))
+        eq(td(days=1.0/24), td(hours=1))
+        eq(td(hours=1.0/60), td(minutes=1))
+        eq(td(minutes=1.0/60), td(seconds=1))
+        eq(td(seconds=0.001), td(milliseconds=1))
+        eq(td(milliseconds=0.001), td(microseconds=1))
+
+    def test_computations(self):
+        eq = self.assertEqual
+        td = timedelta
+
+        a = td(7) # One week
+        b = td(0, 60) # One minute
+        c = td(0, 0, 1000) # One millisecond
+        eq(a+b+c, td(7, 60, 1000))
+        eq(a-b, td(6, 24*3600 - 60))
+        eq(-a, td(-7))
+        eq(+a, td(7))
+        eq(-b, td(-1, 24*3600 - 60))
+        eq(-c, td(-1, 24*3600 - 1, 999000))
+        eq(abs(a), a)
+        eq(abs(-a), a)
+        eq(td(6, 24*3600), a)
+        eq(td(0, 0, 60*1000000), b)
+        eq(a*10, td(70))
+        eq(a*10, 10*a)
+        eq(a*10L, 10*a)
+        eq(b*10, td(0, 600))
+        eq(10*b, td(0, 600))
+        eq(b*10L, td(0, 600))
+        eq(c*10, td(0, 0, 10000))
+        eq(10*c, td(0, 0, 10000))
+        eq(c*10L, td(0, 0, 10000))
+        eq(a*-1, -a)
+        eq(b*-2, -b-b)
+        eq(c*-2, -c+-c)
+        eq(b*(60*24), (b*60)*24)
+        eq(b*(60*24), (60*b)*24)
+        eq(c*1000, td(0, 1))
+        eq(1000*c, td(0, 1))
+        eq(a//7, td(1))
+        eq(b//10, td(0, 6))
+        eq(c//1000, td(0, 0, 1))
+        eq(a//10, td(0, 7*24*360))
+        eq(a//3600000, td(0, 0, 7*24*1000))
+
+    def test_disallowed_computations(self):
+        a = timedelta(42)
+
+        # Add/sub ints, longs, floats should be illegal
+        for i in 1, 1L, 1.0:
+            self.assertRaises(TypeError, lambda: a+i)
+            self.assertRaises(TypeError, lambda: a-i)
+            self.assertRaises(TypeError, lambda: i+a)
+            self.assertRaises(TypeError, lambda: i-a)
+
+        # Mul/div by float isn't supported.
+        x = 2.3
+        self.assertRaises(TypeError, lambda: a*x)
+        self.assertRaises(TypeError, lambda: x*a)
+        self.assertRaises(TypeError, lambda: a/x)
+        self.assertRaises(TypeError, lambda: x/a)
+        self.assertRaises(TypeError, lambda: a // x)
+        self.assertRaises(TypeError, lambda: x // a)
+
+        # Divison of int by timedelta doesn't make sense.
+        # Division by zero doesn't make sense.
+        for zero in 0, 0L:
+            self.assertRaises(TypeError, lambda: zero // a)
+            self.assertRaises(ZeroDivisionError, lambda: a // zero)
+
+    def test_basic_attributes(self):
+        days, seconds, us = 1, 7, 31
+        td = timedelta(days, seconds, us)
+        self.assertEqual(td.days, days)
+        self.assertEqual(td.seconds, seconds)
+        self.assertEqual(td.microseconds, us)
+
+    def test_carries(self):
+        t1 = timedelta(days=100,
+                       weeks=-7,
+                       hours=-24*(100-49),
+                       minutes=-3,
+                       seconds=12,
+                       microseconds=(3*60 - 12) * 1e6 + 1)
+        t2 = timedelta(microseconds=1)
+        self.assertEqual(t1, t2)
+
+    def test_hash_equality(self):
+        t1 = timedelta(days=100,
+                       weeks=-7,
+                       hours=-24*(100-49),
+                       minutes=-3,
+                       seconds=12,
+                       microseconds=(3*60 - 12) * 1000000)
+        t2 = timedelta()
+        self.assertEqual(hash(t1), hash(t2))
+
+        t1 += timedelta(weeks=7)
+        t2 += timedelta(days=7*7)
+        self.assertEqual(t1, t2)
+        self.assertEqual(hash(t1), hash(t2))
+
+        d = {t1: 1}
+        d[t2] = 2
+        self.assertEqual(len(d), 1)
+        self.assertEqual(d[t1], 2)
+
+    def test_pickling(self):
+        import pickle, cPickle
+        args = 12, 34, 56
+        orig = timedelta(*args)
+        state = orig.__getstate__()
+        self.assertEqual(args, state)
+        derived = timedelta()
+        derived.__setstate__(state)
+        self.assertEqual(orig, derived)
+        for pickler in pickle, cPickle:
+            for binary in 0, 1:
+                green = pickler.dumps(orig, binary)
+                derived = pickler.loads(green)
+                self.assertEqual(orig, derived)
+
+    def test_compare(self):
+        t1 = timedelta(2, 3, 4)
+        t2 = timedelta(2, 3, 4)
+        self.failUnless(t1 == t2)
+        self.failUnless(t1 <= t2)
+        self.failUnless(t1 >= t2)
+        self.failUnless(not t1 != t2)
+        self.failUnless(not t1 < t2)
+        self.failUnless(not t1 > t2)
+        self.assertEqual(cmp(t1, t2), 0)
+        self.assertEqual(cmp(t2, t1), 0)
+
+        for args in (3, 3, 3), (2, 4, 4), (2, 3, 5):
+            t2 = timedelta(*args)   # this is larger than t1
+            self.failUnless(t1 < t2)
+            self.failUnless(t2 > t1)
+            self.failUnless(t1 <= t2)
+            self.failUnless(t2 >= t1)
+            self.failUnless(t1 != t2)
+            self.failUnless(t2 != t1)
+            self.failUnless(not t1 == t2)
+            self.failUnless(not t2 == t1)
+            self.failUnless(not t1 > t2)
+            self.failUnless(not t2 < t1)
+            self.failUnless(not t1 >= t2)
+            self.failUnless(not t2 <= t1)
+            self.assertEqual(cmp(t1, t2), -1)
+            self.assertEqual(cmp(t2, t1), 1)
+
+        for badarg in 10, 10L, 34.5, "abc", {}, [], ():
+            self.assertRaises(TypeError, lambda: t1 == badarg)
+            self.assertRaises(TypeError, lambda: t1 != badarg)
+            self.assertRaises(TypeError, lambda: t1 <= badarg)
+            self.assertRaises(TypeError, lambda: t1 < badarg)
+            self.assertRaises(TypeError, lambda: t1 > badarg)
+            self.assertRaises(TypeError, lambda: t1 >= badarg)
+            self.assertRaises(TypeError, lambda: badarg == t1)
+            self.assertRaises(TypeError, lambda: badarg != t1)
+            self.assertRaises(TypeError, lambda: badarg <= t1)
+            self.assertRaises(TypeError, lambda: badarg < t1)
+            self.assertRaises(TypeError, lambda: badarg > t1)
+            self.assertRaises(TypeError, lambda: badarg >= t1)
+
+    def test_str(self):
+        td = timedelta
+        eq = self.assertEqual
+
+        eq(str(td(1)), "1 day, 0:00:00")
+        eq(str(td(-1)), "-1 day, 0:00:00")
+        eq(str(td(2)), "2 days, 0:00:00")
+        eq(str(td(-2)), "-2 days, 0:00:00")
+
+        eq(str(td(hours=12, minutes=58, seconds=59)), "12:58:59")
+        eq(str(td(hours=2, minutes=3, seconds=4)), "2:03:04")
+        eq(str(td(weeks=-30, hours=23, minutes=12, seconds=34)),
+           "-210 days, 23:12:34")
+
+        eq(str(td(milliseconds=1)), "0:00:00.001000")
+        eq(str(td(microseconds=3)), "0:00:00.000003")
+
+        eq(str(td(days=999999999, hours=23, minutes=59, seconds=59,
+                   microseconds=999999)),
+           "999999999 days, 23:59:59.999999")
+
+    def test_roundtrip(self):
+        for td in (timedelta(days=999999999, hours=23, minutes=59,
+                             seconds=59, microseconds=999999),
+                   timedelta(days=-999999999),
+                   timedelta(days=1, seconds=2, microseconds=3)):
+
+            # Verify td -> string -> td identity.
+            s = repr(td)
+            self.failUnless(s.startswith('datetime.'))
+            s = s[9:]
+            td2 = eval(s)
+            self.assertEqual(td, td2)
+
+            # Verify identity via reconstructing from pieces.
+            td2 = timedelta(td.days, td.seconds, td.microseconds)
+            self.assertEqual(td, td2)
+
+    def test_resolution_info(self):
+        self.assert_(isinstance(timedelta.min, timedelta))
+        self.assert_(isinstance(timedelta.max, timedelta))
+        self.assert_(isinstance(timedelta.resolution, timedelta))
+        self.assert_(timedelta.max > timedelta.min)
+        self.assertEqual(timedelta.min, timedelta(-999999999))
+        self.assertEqual(timedelta.max, timedelta(999999999, 24*3600-1, 1e6-1))
+        self.assertEqual(timedelta.resolution, timedelta(0, 0, 1))
+
+    def test_overflow(self):
+        tiny = timedelta.resolution
+
+        td = timedelta.min + tiny
+        td -= tiny  # no problem
+        self.assertRaises(OverflowError, td.__sub__, tiny)
+        self.assertRaises(OverflowError, td.__add__, -tiny)
+
+        td = timedelta.max - tiny
+        td += tiny  # no problem
+        self.assertRaises(OverflowError, td.__add__, tiny)
+        self.assertRaises(OverflowError, td.__sub__, -tiny)
+
+        self.assertRaises(OverflowError, lambda: -timedelta.max)
+
+    def test_microsecond_rounding(self):
+        td = timedelta
+        eq = self.assertEqual
+
+        # Single-field rounding.
+        eq(td(milliseconds=0.4/1000), td(0))    # rounds to 0
+        eq(td(milliseconds=-0.4/1000), td(0))    # rounds to 0
+        eq(td(milliseconds=0.6/1000), td(microseconds=1))
+        eq(td(milliseconds=-0.6/1000), td(microseconds=-1))
+
+        # Rounding due to contributions from more than one field.
+        us_per_hour = 3600e6
+        us_per_day = us_per_hour * 24
+        eq(td(days=.4/us_per_day), td(0))
+        eq(td(hours=.2/us_per_hour), td(0))
+        eq(td(days=.4/us_per_day, hours=.2/us_per_hour), td(microseconds=1))
+
+        eq(td(days=-.4/us_per_day), td(0))
+        eq(td(hours=-.2/us_per_hour), td(0))
+        eq(td(days=-.4/us_per_day, hours=-.2/us_per_hour), td(microseconds=-1))
+
+    def test_massive_normalization(self):
+        td = timedelta(microseconds=-1)
+        self.assertEqual((td.days, td.seconds, td.microseconds),
+                         (-1, 24*3600-1, 999999))
+
+    def test_bool(self):
+        self.failUnless(timedelta(1))
+        self.failUnless(timedelta(0, 1))
+        self.failUnless(timedelta(0, 0, 1))
+        self.failUnless(timedelta(microseconds=1))
+        self.failUnless(not timedelta(0))
+
+#############################################################################
+# date tests
+
+class TestDateOnly(unittest.TestCase):
+    # Tests here won't pass if also run on datetime objects, so don't
+    # subclass this to test datetimes too.
+
+    def test_delta_non_days_ignored(self):
+        dt = date(2000, 1, 2)
+        delta = timedelta(days=1, hours=2, minutes=3, seconds=4,
+                          microseconds=5)
+        days = timedelta(delta.days)
+        self.assertEqual(days, timedelta(1))
+
+        dt2 = dt + delta
+        self.assertEqual(dt2, dt + days)
+
+        dt2 = delta + dt
+        self.assertEqual(dt2, dt + days)
+
+        dt2 = dt - delta
+        self.assertEqual(dt2, dt - days)
+
+        delta = -delta
+        days = timedelta(delta.days)
+        self.assertEqual(days, timedelta(-2))
+
+        dt2 = dt + delta
+        self.assertEqual(dt2, dt + days)
+
+        dt2 = delta + dt
+        self.assertEqual(dt2, dt + days)
+
+        dt2 = dt - delta
+        self.assertEqual(dt2, dt - days)
+
+class TestDate(unittest.TestCase):
+    # Tests here should pass for both dates and datetimes, except for a
+    # few tests that TestDateTime overrides.
+
+    theclass = date
+
+    def test_basic_attributes(self):
+        dt = self.theclass(2002, 3, 1)
+        self.assertEqual(dt.year, 2002)
+        self.assertEqual(dt.month, 3)
+        self.assertEqual(dt.day, 1)
+
+    def test_roundtrip(self):
+        for dt in (self.theclass(1, 2, 3),
+                   self.theclass.today()):
+            # Verify dt -> string -> date identity.
+            s = repr(dt)
+            self.failUnless(s.startswith('datetime.'))
+            s = s[9:]
+            dt2 = eval(s)
+            self.assertEqual(dt, dt2)
+
+            # Verify identity via reconstructing from pieces.
+            dt2 = self.theclass(dt.year, dt.month, dt.day)
+            self.assertEqual(dt, dt2)
+
+    def test_ordinal_conversions(self):
+        # Check some fixed values.
+        for y, m, d, n in [(1, 1, 1, 1),      # calendar origin
+                           (1, 12, 31, 365),
+                           (2, 1, 1, 366),
+                           # first example from "Calendrical Calculations"
+                           (1945, 11, 12, 710347)]:
+            d = self.theclass(y, m, d)
+            self.assertEqual(n, d.toordinal())
+            fromord = self.theclass.fromordinal(n)
+            self.assertEqual(d, fromord)
+            if hasattr(fromord, "hour"):
+                # if we're checking something fancier than a date, verify
+                # the extra fields have been zeroed out
+                self.assertEqual(fromord.hour, 0)
+                self.assertEqual(fromord.minute, 0)
+                self.assertEqual(fromord.second, 0)
+                self.assertEqual(fromord.microsecond, 0)
+
+        # Check first and last days of year spottily across the whole
+        # range of years supported.
+        for year in xrange(MINYEAR, MAXYEAR+1, 7):
+            # Verify (year, 1, 1) -> ordinal -> y, m, d is identity.
+            d = self.theclass(year, 1, 1)
+            n = d.toordinal()
+            d2 = self.theclass.fromordinal(n)
+            self.assertEqual(d, d2)
+            # Verify that moving back a day gets to the end of year-1.
+            if year > 1:
+                d = self.theclass.fromordinal(n-1)
+                d2 = self.theclass(year-1, 12, 31)
+                self.assertEqual(d, d2)
+                self.assertEqual(d2.toordinal(), n-1)
+
+        # Test every day in a leap-year and a non-leap year.
+        dim = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
+        for year, isleap in (2000, True), (2002, False):
+            n = self.theclass(year, 1, 1).toordinal()
+            for month, maxday in zip(range(1, 13), dim):
+                if month == 2 and isleap:
+                    maxday += 1
+                for day in range(1, maxday+1):
+                    d = self.theclass(year, month, day)
+                    self.assertEqual(d.toordinal(), n)
+                    self.assertEqual(d, self.theclass.fromordinal(n))
+                    n += 1
+
+    def test_extreme_ordinals(self):
+        a = self.theclass.min
+        a = self.theclass(a.year, a.month, a.day)  # get rid of time parts
+        aord = a.toordinal()
+        b = a.fromordinal(aord)
+        self.assertEqual(a, b)
+
+        self.assertRaises(ValueError, lambda: a.fromordinal(aord - 1))
+
+        b = a + timedelta(days=1)
+        self.assertEqual(b.toordinal(), aord + 1)
+        self.assertEqual(b, self.theclass.fromordinal(aord + 1))
+
+        a = self.theclass.max
+        a = self.theclass(a.year, a.month, a.day)  # get rid of time parts
+        aord = a.toordinal()
+        b = a.fromordinal(aord)
+        self.assertEqual(a, b)
+
+        self.assertRaises(ValueError, lambda: a.fromordinal(aord + 1))
+
+        b = a - timedelta(days=1)
+        self.assertEqual(b.toordinal(), aord - 1)
+        self.assertEqual(b, self.theclass.fromordinal(aord - 1))
+
+    def test_bad_constructor_arguments(self):
+        # bad years
+        self.theclass(MINYEAR, 1, 1)  # no exception
+        self.theclass(MAXYEAR, 1, 1)  # no exception
+        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
+        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
+        # bad months
+        self.theclass(2000, 1, 1)    # no exception
+        self.theclass(2000, 12, 1)   # no exception
+        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
+        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
+        # bad days
+        self.theclass(2000, 2, 29)   # no exception
+        self.theclass(2004, 2, 29)   # no exception
+        self.theclass(2400, 2, 29)   # no exception
+        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
+        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
+        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
+        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
+        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
+        self.assertRaises(ValueError, self.theclass, 2000, 1, 32)
+
+    def test_hash_equality(self):
+        d = self.theclass(2000, 12, 31)
+        # same thing
+        e = self.theclass(2000, 12, 31)
+        self.assertEqual(d, e)
+        self.assertEqual(hash(d), hash(e))
+
+        dic = {d: 1}
+        dic[e] = 2
+        self.assertEqual(len(dic), 1)
+        self.assertEqual(dic[d], 2)
+        self.assertEqual(dic[e], 2)
+
+        d = self.theclass(2001,  1,  1)
+        # same thing
+        e = self.theclass(2001,  1,  1)
+        self.assertEqual(d, e)
+        self.assertEqual(hash(d), hash(e))
+
+        dic = {d: 1}
+        dic[e] = 2
+        self.assertEqual(len(dic), 1)
+        self.assertEqual(dic[d], 2)
+        self.assertEqual(dic[e], 2)
+
+    def test_computations(self):
+        a = self.theclass(2002, 1, 31)
+        b = self.theclass(1956, 1, 31)
+
+        diff = a-b
+        self.assertEqual(diff.days, 46*365 + len(range(1956, 2002, 4)))
+        self.assertEqual(diff.seconds, 0)
+        self.assertEqual(diff.microseconds, 0)
+
+        day = timedelta(1)
+        week = timedelta(7)
+        a = self.theclass(2002, 3, 2)
+        self.assertEqual(a + day, self.theclass(2002, 3, 3))
+        self.assertEqual(day + a, self.theclass(2002, 3, 3))
+        self.assertEqual(a - day, self.theclass(2002, 3, 1))
+        self.assertEqual(-day + a, self.theclass(2002, 3, 1))
+        self.assertEqual(a + week, self.theclass(2002, 3, 9))
+        self.assertEqual(a - week, self.theclass(2002, 2, 23))
+        self.assertEqual(a + 52*week, self.theclass(2003, 3, 1))
+        self.assertEqual(a - 52*week, self.theclass(2001, 3, 3))
+        self.assertEqual((a + week) - a, week)
+        self.assertEqual((a + day) - a, day)
+        self.assertEqual((a - week) - a, -week)
+        self.assertEqual((a - day) - a, -day)
+        self.assertEqual(a - (a + week), -week)
+        self.assertEqual(a - (a + day), -day)
+        self.assertEqual(a - (a - week), week)
+        self.assertEqual(a - (a - day), day)
+
+        # Add/sub ints, longs, floats should be illegal
+        for i in 1, 1L, 1.0:
+            self.assertRaises(TypeError, lambda: a+i)
+            self.assertRaises(TypeError, lambda: a-i)
+            self.assertRaises(TypeError, lambda: i+a)
+            self.assertRaises(TypeError, lambda: i-a)
+
+        # delta - date is senseless.
+        self.assertRaises(TypeError, lambda: day - a)
+        # mixing date and (delta or date) via * or // is senseless
+        self.assertRaises(TypeError, lambda: day * a)
+        self.assertRaises(TypeError, lambda: a * day)
+        self.assertRaises(TypeError, lambda: day // a)
+        self.assertRaises(TypeError, lambda: a // day)
+        self.assertRaises(TypeError, lambda: a * a)
+        self.assertRaises(TypeError, lambda: a // a)
+        # date + date is senseless
+        self.assertRaises(TypeError, lambda: a + a)
+
+    def test_overflow(self):
+        tiny = self.theclass.resolution
+
+        dt = self.theclass.min + tiny
+        dt -= tiny  # no problem
+        self.assertRaises(OverflowError, dt.__sub__, tiny)
+        self.assertRaises(OverflowError, dt.__add__, -tiny)
+
+        dt = self.theclass.max - tiny
+        dt += tiny  # no problem
+        self.assertRaises(OverflowError, dt.__add__, tiny)
+        self.assertRaises(OverflowError, dt.__sub__, -tiny)
+
+    def test_fromtimestamp(self):
+        import time
+
+        # Try an arbitrary fixed value.
+        year, month, day = 1999, 9, 19
+        ts = time.mktime((year, month, day, 0, 0, 0, 0, 0, -1))
+        d = self.theclass.fromtimestamp(ts)
+        self.assertEqual(d.year, year)
+        self.assertEqual(d.month, month)
+        self.assertEqual(d.day, day)
+
+    def test_today(self):
+        import time
+
+        # We claim that today() is like fromtimestamp(time.time()), so
+        # prove it.
+        for dummy in range(3):
+            today = self.theclass.today()
+            ts = time.time()
+            todayagain = self.theclass.fromtimestamp(ts)
+            if today == todayagain:
+                break
+            # There are several legit reasons that could fail:
+            # 1. It recently became midnight, between the today() and the
+            #    time() calls.
+            # 2. The platform time() has such fine resolution that we'll
+            #    never get the same value twice.
+            # 3. The platform time() has poor resolution, and we just
+            #    happened to call today() right before a resolution quantum
+            #    boundary.
+            # 4. The system clock got fiddled between calls.
+            # In any case, wait a little while and try again.
+            time.sleep(0.1)
+
+        # It worked or it didn't.  If it didn't, assume it's reason #2, and
+        # let the test pass if they're within half a second of each other.
+        self.failUnless(today == todayagain or
+                        abs(todayagain - today) < timedelta(seconds=0.5))
+
+    def test_weekday(self):
+        for i in range(7):
+            # March 4, 2002 is a Monday
+            self.assertEqual(self.theclass(2002, 3, 4+i).weekday(), i)
+            self.assertEqual(self.theclass(2002, 3, 4+i).isoweekday(), i+1)
+            # January 2, 1956 is a Monday
+            self.assertEqual(self.theclass(1956, 1, 2+i).weekday(), i)
+            self.assertEqual(self.theclass(1956, 1, 2+i).isoweekday(), i+1)
+
+    def test_isocalendar(self):
+        # Check examples from
+        # http://www.phys.uu.nl/~vgent/calendar/isocalendar.htm
+        for i in range(7):
+            d = self.theclass(2003, 12, 22+i)
+            self.assertEqual(d.isocalendar(), (2003, 52, i+1))
+            d = self.theclass(2003, 12, 29) + timedelta(i)
+            self.assertEqual(d.isocalendar(), (2004, 1, i+1))
+            d = self.theclass(2004, 1, 5+i)
+            self.assertEqual(d.isocalendar(), (2004, 2, i+1))
+            d = self.theclass(2009, 12, 21+i)
+            self.assertEqual(d.isocalendar(), (2009, 52, i+1))
+            d = self.theclass(2009, 12, 28) + timedelta(i)
+            self.assertEqual(d.isocalendar(), (2009, 53, i+1))
+            d = self.theclass(2010, 1, 4+i)
+            self.assertEqual(d.isocalendar(), (2010, 1, i+1))
+
+    def test_iso_long_years(self):
+        # Calculate long ISO years and compare to table from
+        # http://www.phys.uu.nl/~vgent/calendar/isocalendar.htm
+        ISO_LONG_YEARS_TABLE = """
+              4   32   60   88
+              9   37   65   93
+             15   43   71   99
+             20   48   76
+             26   54   82
+
+            105  133  161  189
+            111  139  167  195
+            116  144  172
+            122  150  178
+            128  156  184
+
+            201  229  257  285
+            207  235  263  291
+            212  240  268  296
+            218  246  274
+            224  252  280
+
+            303  331  359  387
+            308  336  364  392
+            314  342  370  398
+            320  348  376
+            325  353  381
+        """
+        iso_long_years = map(int, ISO_LONG_YEARS_TABLE.split())
+        iso_long_years.sort()
+        L = []
+        for i in range(400):
+            d = self.theclass(2000+i, 12, 31)
+            d1 = self.theclass(1600+i, 12, 31)
+            self.assertEqual(d.isocalendar()[1:], d1.isocalendar()[1:])
+            if d.isocalendar()[1] == 53:
+                L.append(i)
+        self.assertEqual(L, iso_long_years)
+
+    def test_isoformat(self):
+        t = self.theclass(2, 3, 2)
+        self.assertEqual(t.isoformat(), "0002-03-02")
+
+    def test_ctime(self):
+        t = self.theclass(2002, 3, 2)
+        self.assertEqual(t.ctime(), "Sat Mar  2 00:00:00 2002")
+
+    def test_strftime(self):
+        t = self.theclass(2005, 3, 2)
+        self.assertEqual(t.strftime("m:%m d:%d y:%y"), "m:03 d:02 y:05")
+
+        self.assertRaises(TypeError, t.strftime) # needs an arg
+        self.assertRaises(TypeError, t.strftime, "one", "two") # too many args
+        self.assertRaises(TypeError, t.strftime, 42) # arg wrong type
+
+        # A naive object replaces %z and %Z w/ empty strings.
+        self.assertEqual(t.strftime("'%z' '%Z'"), "'' ''")
+
+    def test_resolution_info(self):
+        self.assert_(isinstance(self.theclass.min, self.theclass))
+        self.assert_(isinstance(self.theclass.max, self.theclass))
+        self.assert_(isinstance(self.theclass.resolution, timedelta))
+        self.assert_(self.theclass.max > self.theclass.min)
+
+    def test_extreme_timedelta(self):
+        big = self.theclass.max - self.theclass.min
+        # 3652058 days, 23 hours, 59 minutes, 59 seconds, 999999 microseconds
+        n = (big.days*24*3600 + big.seconds)*1000000 + big.microseconds
+        # n == 315537897599999999 ~= 2**58.13
+        justasbig = timedelta(0, 0, n)
+        self.assertEqual(big, justasbig)
+        self.assertEqual(self.theclass.min + big, self.theclass.max)
+        self.assertEqual(self.theclass.max - big, self.theclass.min)
+
+    def test_timetuple(self):
+        for i in range(7):
+            # January 2, 1956 is a Monday (0)
+            d = self.theclass(1956, 1, 2+i)
+            t = d.timetuple()
+            self.assertEqual(t, (1956, 1, 2+i, 0, 0, 0, i, 2+i, -1))
+            # February 1, 1956 is a Wednesday (2)
+            d = self.theclass(1956, 2, 1+i)
+            t = d.timetuple()
+            self.assertEqual(t, (1956, 2, 1+i, 0, 0, 0, (2+i)%7, 32+i, -1))
+            # March 1, 1956 is a Thursday (3), and is the 31+29+1 = 61st day
+            # of the year.
+            d = self.theclass(1956, 3, 1+i)
+            t = d.timetuple()
+            self.assertEqual(t, (1956, 3, 1+i, 0, 0, 0, (3+i)%7, 61+i, -1))
+            self.assertEqual(t.tm_year, 1956)
+            self.assertEqual(t.tm_mon, 3)
+            self.assertEqual(t.tm_mday, 1+i)
+            self.assertEqual(t.tm_hour, 0)
+            self.assertEqual(t.tm_min, 0)
+            self.assertEqual(t.tm_sec, 0)
+            self.assertEqual(t.tm_wday, (3+i)%7)
+            self.assertEqual(t.tm_yday, 61+i)
+            self.assertEqual(t.tm_isdst, -1)
+
+    def test_pickling(self):
+        import pickle, cPickle
+        args = 6, 7, 23
+        orig = self.theclass(*args)
+        state = orig.__getstate__()
+        self.assertEqual(state, '\x00\x06\x07\x17')
+        derived = self.theclass(1, 1, 1)
+        derived.__setstate__(state)
+        self.assertEqual(orig, derived)
+        for pickler in pickle, cPickle:
+            for binary in 0, 1:
+                green = pickler.dumps(orig, binary)
+                derived = pickler.loads(green)
+                self.assertEqual(orig, derived)
+
+    def test_compare(self):
+        t1 = self.theclass(2, 3, 4)
+        t2 = self.theclass(2, 3, 4)
+        self.failUnless(t1 == t2)
+        self.failUnless(t1 <= t2)
+        self.failUnless(t1 >= t2)
+        self.failUnless(not t1 != t2)
+        self.failUnless(not t1 < t2)
+        self.failUnless(not t1 > t2)
+        self.assertEqual(cmp(t1, t2), 0)
+        self.assertEqual(cmp(t2, t1), 0)
+
+        for args in (3, 3, 3), (2, 4, 4), (2, 3, 5):
+            t2 = self.theclass(*args)   # this is larger than t1
+            self.failUnless(t1 < t2)
+            self.failUnless(t2 > t1)
+            self.failUnless(t1 <= t2)
+            self.failUnless(t2 >= t1)
+            self.failUnless(t1 != t2)
+            self.failUnless(t2 != t1)
+            self.failUnless(not t1 == t2)
+            self.failUnless(not t2 == t1)
+            self.failUnless(not t1 > t2)
+            self.failUnless(not t2 < t1)
+            self.failUnless(not t1 >= t2)
+            self.failUnless(not t2 <= t1)
+            self.assertEqual(cmp(t1, t2), -1)
+            self.assertEqual(cmp(t2, t1), 1)
+
+        for badarg in 10, 10L, 34.5, "abc", {}, [], ():
+            self.assertRaises(TypeError, lambda: t1 == badarg)
+            self.assertRaises(TypeError, lambda: t1 != badarg)
+            self.assertRaises(TypeError, lambda: t1 <= badarg)
+            self.assertRaises(TypeError, lambda: t1 < badarg)
+            self.assertRaises(TypeError, lambda: t1 > badarg)
+            self.assertRaises(TypeError, lambda: t1 >= badarg)
+            self.assertRaises(TypeError, lambda: badarg == t1)
+            self.assertRaises(TypeError, lambda: badarg != t1)
+            self.assertRaises(TypeError, lambda: badarg <= t1)
+            self.assertRaises(TypeError, lambda: badarg < t1)
+            self.assertRaises(TypeError, lambda: badarg > t1)
+            self.assertRaises(TypeError, lambda: badarg >= t1)
+
+    def test_bool(self):
+        # All dates are considered true.
+        self.failUnless(self.theclass.min)
+        self.failUnless(self.theclass.max)
+
+#############################################################################
+# datetime tests
+
+class TestDateTime(TestDate):
+
+    theclass = datetime
+
+    def test_basic_attributes(self):
+        dt = self.theclass(2002, 3, 1, 12, 0)
+        self.assertEqual(dt.year, 2002)
+        self.assertEqual(dt.month, 3)
+        self.assertEqual(dt.day, 1)
+        self.assertEqual(dt.hour, 12)
+        self.assertEqual(dt.minute, 0)
+        self.assertEqual(dt.second, 0)
+        self.assertEqual(dt.microsecond, 0)
+
+    def test_basic_attributes_nonzero(self):
+        # Make sure all attributes are non-zero so bugs in
+        # bit-shifting access show up.
+        dt = self.theclass(2002, 3, 1, 12, 59, 59, 8000)
+        self.assertEqual(dt.year, 2002)
+        self.assertEqual(dt.month, 3)
+        self.assertEqual(dt.day, 1)
+        self.assertEqual(dt.hour, 12)
+        self.assertEqual(dt.minute, 59)
+        self.assertEqual(dt.second, 59)
+        self.assertEqual(dt.microsecond, 8000)
+
+    def test_roundtrip(self):
+        for dt in (self.theclass(1, 2, 3, 4, 5, 6, 7),
+                   self.theclass.now()):
+            # Verify dt -> string -> datetime identity.
+            s = repr(dt)
+            self.failUnless(s.startswith('datetime.'))
+            s = s[9:]
+            dt2 = eval(s)
+            self.assertEqual(dt, dt2)
+
+            # Verify identity via reconstructing from pieces.
+            dt2 = self.theclass(dt.year, dt.month, dt.day,
+                                dt.hour, dt.minute, dt.second,
+                                dt.microsecond)
+            self.assertEqual(dt, dt2)
+
+    def test_isoformat(self):
+        t = self.theclass(2, 3, 2, 4, 5, 1, 123)
+        self.assertEqual(t.isoformat(),    "0002-03-02T04:05:01.000123")
+        self.assertEqual(t.isoformat('T'), "0002-03-02T04:05:01.000123")
+        self.assertEqual(t.isoformat(' '), "0002-03-02 04:05:01.000123")
+        # str is ISO format with the separator forced to a blank.
+        self.assertEqual(str(t), "0002-03-02 04:05:01.000123")
+
+        t = self.theclass(2, 3, 2)
+        self.assertEqual(t.isoformat(),    "0002-03-02T00:00:00")
+        self.assertEqual(t.isoformat('T'), "0002-03-02T00:00:00")
+        self.assertEqual(t.isoformat(' '), "0002-03-02 00:00:00")
+        # str is ISO format with the separator forced to a blank.
+        self.assertEqual(str(t), "0002-03-02 00:00:00")
+
+    def test_more_ctime(self):
+        # Test fields that TestDate doesn't touch.
+        import time
+
+        t = self.theclass(2002, 3, 2, 18, 3, 5, 123)
+        self.assertEqual(t.ctime(), "Sat Mar  2 18:03:05 2002")
+        # Oops!  The next line fails on Win2K under MSVC 6, so it's commented
+        # out.  The difference is that t.ctime() produces " 2" for the day,
+        # but platform ctime() produces "02" for the day.  According to
+        # C99, t.ctime() is correct here.
+        # self.assertEqual(t.ctime(), time.ctime(time.mktime(t.timetuple())))
+
+        # So test a case where that difference doesn't matter.
+        t = self.theclass(2002, 3, 22, 18, 3, 5, 123)
+        self.assertEqual(t.ctime(), time.ctime(time.mktime(t.timetuple())))
+
+    def test_tz_independent_comparing(self):
+        dt1 = self.theclass(2002, 3, 1, 9, 0, 0)
+        dt2 = self.theclass(2002, 3, 1, 10, 0, 0)
+        dt3 = self.theclass(2002, 3, 1, 9, 0, 0)
+        self.assertEqual(dt1, dt3)
+        self.assert_(dt2 > dt3)
+
+        # Make sure comparison doesn't forget microseconds, and isn't done
+        # via comparing a float timestamp (an IEEE double doesn't have enough
+        # precision to span microsecond resolution across years 1 thru 9999,
+        # so comparing via timestamp necessarily calls some distinct values
+        # equal).
+        dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
+        us = timedelta(microseconds=1)
+        dt2 = dt1 + us
+        self.assertEqual(dt2 - dt1, us)
+        self.assert_(dt1 < dt2)
+
+    def test_bad_constructor_arguments(self):
+        # bad years
+        self.theclass(MINYEAR, 1, 1)  # no exception
+        self.theclass(MAXYEAR, 1, 1)  # no exception
+        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
+        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
+        # bad months
+        self.theclass(2000, 1, 1)    # no exception
+        self.theclass(2000, 12, 1)   # no exception
+        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
+        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
+        # bad days
+        self.theclass(2000, 2, 29)   # no exception
+        self.theclass(2004, 2, 29)   # no exception
+        self.theclass(2400, 2, 29)   # no exception
+        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
+        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
+        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
+        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
+        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
+        self.assertRaises(ValueError, self.theclass, 2000, 1, 32)
+        # bad hours
+        self.theclass(2000, 1, 31, 0)    # no exception
+        self.theclass(2000, 1, 31, 23)   # no exception
+        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, -1)
+        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, 24)
+        # bad minutes
+        self.theclass(2000, 1, 31, 23, 0)    # no exception
+        self.theclass(2000, 1, 31, 23, 59)   # no exception
+        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, 23, -1)
+        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, 23, 60)
+        # bad seconds
+        self.theclass(2000, 1, 31, 23, 59, 0)    # no exception
+        self.theclass(2000, 1, 31, 23, 59, 59)   # no exception
+        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, 23, 59, -1)
+        self.assertRaises(ValueError, self.theclass, 2000, 1, 31, 23, 59, 60)
+        # bad microseconds
+        self.theclass(2000, 1, 31, 23, 59, 59, 0)    # no exception
+        self.theclass(2000, 1, 31, 23, 59, 59, 999999)   # no exception
+        self.assertRaises(ValueError, self.theclass,
+                          2000, 1, 31, 23, 59, 59, -1)
+        self.assertRaises(ValueError, self.theclass,
+                          2000, 1, 31, 23, 59, 59,
+                          1000000)
+
+    def test_hash_equality(self):
+        d = self.theclass(2000, 12, 31, 23, 30, 17)
+        e = self.theclass(2000, 12, 31, 23, 30, 17)
+        self.assertEqual(d, e)
+        self.assertEqual(hash(d), hash(e))
+
+        dic = {d: 1}
+        dic[e] = 2
+        self.assertEqual(len(dic), 1)
+        self.assertEqual(dic[d], 2)
+        self.assertEqual(dic[e], 2)
+
+        d = self.theclass(2001,  1,  1,  0,  5, 17)
+        e = self.theclass(2001,  1,  1,  0,  5, 17)
+        self.assertEqual(d, e)
+        self.assertEqual(hash(d), hash(e))
+
+        dic = {d: 1}
+        dic[e] = 2
+        self.assertEqual(len(dic), 1)
+        self.assertEqual(dic[d], 2)
+        self.assertEqual(dic[e], 2)
+
+    def test_computations(self):
+        a = self.theclass(2002, 1, 31)
+        b = self.theclass(1956, 1, 31)
+        diff = a-b
+        self.assertEqual(diff.days, 46*365 + len(range(1956, 2002, 4)))
+        self.assertEqual(diff.seconds, 0)
+        self.assertEqual(diff.microseconds, 0)
+        a = self.theclass(2002, 3, 2, 17, 6)
+        millisec = timedelta(0, 0, 1000)
+        hour = timedelta(0, 3600)
+        day = timedelta(1)
+        week = timedelta(7)
+        self.assertEqual(a + hour, self.theclass(2002, 3, 2, 18, 6))
+        self.assertEqual(hour + a, self.theclass(2002, 3, 2, 18, 6))
+        self.assertEqual(a + 10*hour, self.theclass(2002, 3, 3, 3, 6))
+        self.assertEqual(a - hour, self.theclass(2002, 3, 2, 16, 6))
+        self.assertEqual(-hour + a, self.theclass(2002, 3, 2, 16, 6))
+        self.assertEqual(a - hour, a + -hour)
+        self.assertEqual(a - 20*hour, self.theclass(2002, 3, 1, 21, 6))
+        self.assertEqual(a + day, self.theclass(2002, 3, 3, 17, 6))
+        self.assertEqual(a - day, self.theclass(2002, 3, 1, 17, 6))
+        self.assertEqual(a + week, self.theclass(2002, 3, 9, 17, 6))
+        self.assertEqual(a - week, self.theclass(2002, 2, 23, 17, 6))
+        self.assertEqual(a + 52*week, self.theclass(2003, 3, 1, 17, 6))
+        self.assertEqual(a - 52*week, self.theclass(2001, 3, 3, 17, 6))
+        self.assertEqual((a + week) - a, week)
+        self.assertEqual((a + day) - a, day)
+        self.assertEqual((a + hour) - a, hour)
+        self.assertEqual((a + millisec) - a, millisec)
+        self.assertEqual((a - week) - a, -week)
+        self.assertEqual((a - day) - a, -day)
+        self.assertEqual((a - hour) - a, -hour)
+        self.assertEqual((a - millisec) - a, -millisec)
+        self.assertEqual(a - (a + week), -week)
+        self.assertEqual(a - (a + day), -day)
+        self.assertEqual(a - (a + hour), -hour)
+        self.assertEqual(a - (a + millisec), -millisec)
+        self.assertEqual(a - (a - week), week)
+        self.assertEqual(a - (a - day), day)
+        self.assertEqual(a - (a - hour), hour)
+        self.assertEqual(a - (a - millisec), millisec)
+        self.assertEqual(a + (week + day + hour + millisec),
+                         self.theclass(2002, 3, 10, 18, 6, 0, 1000))
+        self.assertEqual(a + (week + day + hour + millisec),
+                         (((a + week) + day) + hour) + millisec)
+        self.assertEqual(a - (week + day + hour + millisec),
+                         self.theclass(2002, 2, 22, 16, 5, 59, 999000))
+        self.assertEqual(a - (week + day + hour + millisec),
+                         (((a - week) - day) - hour) - millisec)
+        # Add/sub ints, longs, floats should be illegal
+        for i in 1, 1L, 1.0:
+            self.assertRaises(TypeError, lambda: a+i)
+            self.assertRaises(TypeError, lambda: a-i)
+            self.assertRaises(TypeError, lambda: i+a)
+            self.assertRaises(TypeError, lambda: i-a)
+
+        # delta - datetime is senseless.
+        self.assertRaises(TypeError, lambda: day - a)
+        # mixing datetime and (delta or datetime) via * or // is senseless
+        self.assertRaises(TypeError, lambda: day * a)
+        self.assertRaises(TypeError, lambda: a * day)
+        self.assertRaises(TypeError, lambda: day // a)
+        self.assertRaises(TypeError, lambda: a // day)
+        self.assertRaises(TypeError, lambda: a * a)
+        self.assertRaises(TypeError, lambda: a // a)
+        # datetime + datetime is senseless
+        self.assertRaises(TypeError, lambda: a + a)
+
+    def test_pickling(self):
+        import pickle, cPickle
+        args = 6, 7, 23, 20, 59, 1, 64**2
+        orig = self.theclass(*args)
+        state = orig.__getstate__()
+        self.assertEqual(state, '\x00\x06\x07\x17\x14\x3b\x01\x00\x10\x00')
+        derived = self.theclass(1, 1, 1)
+        derived.__setstate__(state)
+        self.assertEqual(orig, derived)
+        for pickler in pickle, cPickle:
+            for binary in 0, 1:
+                green = pickler.dumps(orig, binary)
+                derived = pickler.loads(green)
+                self.assertEqual(orig, derived)
+
+    def test_more_compare(self):
+        # The test_compare() inherited from TestDate covers the error cases.
+        # We just want to test lexicographic ordering on the members datetime
+        # has that date lacks.
+        args = [2000, 11, 29, 20, 58, 16, 999998]
+        t1 = self.theclass(*args)
+        t2 = self.theclass(*args)
+        self.failUnless(t1 == t2)
+        self.failUnless(t1 <= t2)
+        self.failUnless(t1 >= t2)
+        self.failUnless(not t1 != t2)
+        self.failUnless(not t1 < t2)
+        self.failUnless(not t1 > t2)
+        self.assertEqual(cmp(t1, t2), 0)
+        self.assertEqual(cmp(t2, t1), 0)
+
+        for i in range(len(args)):
+            newargs = args[:]
+            newargs[i] = args[i] + 1
+            t2 = self.theclass(*newargs)   # this is larger than t1
+            self.failUnless(t1 < t2)
+            self.failUnless(t2 > t1)
+            self.failUnless(t1 <= t2)
+            self.failUnless(t2 >= t1)
+            self.failUnless(t1 != t2)
+            self.failUnless(t2 != t1)
+            self.failUnless(not t1 == t2)
+            self.failUnless(not t2 == t1)
+            self.failUnless(not t1 > t2)
+            self.failUnless(not t2 < t1)
+            self.failUnless(not t1 >= t2)
+            self.failUnless(not t2 <= t1)
+            self.assertEqual(cmp(t1, t2), -1)
+            self.assertEqual(cmp(t2, t1), 1)
+
+
+    # A helper for timestamp constructor tests.
+    def verify_field_equality(self, expected, got):
+        self.assertEqual(expected.tm_year, got.year)
+        self.assertEqual(expected.tm_mon, got.month)
+        self.assertEqual(expected.tm_mday, got.day)
+        self.assertEqual(expected.tm_hour, got.hour)
+        self.assertEqual(expected.tm_min, got.minute)
+        self.assertEqual(expected.tm_sec, got.second)
+
+    def test_fromtimestamp(self):
+        import time
+
+        ts = time.time()
+        expected = time.localtime(ts)
+        got = self.theclass.fromtimestamp(ts)
+        self.verify_field_equality(expected, got)
+
+    def test_utcfromtimestamp(self):
+        import time
+
+        ts = time.time()
+        expected = time.gmtime(ts)
+        got = self.theclass.utcfromtimestamp(ts)
+        self.verify_field_equality(expected, got)
+
+    def test_utcnow(self):
+        import time
+
+        # Call it a success if utcnow() and utcfromtimestamp() are within
+        # a second of each other.
+        tolerance = timedelta(seconds=1)
+        for dummy in range(3):
+            from_now = self.theclass.utcnow()
+            from_timestamp = self.theclass.utcfromtimestamp(time.time())
+            if abs(from_timestamp - from_now) <= tolerance:
+                break
+            # Else try again a few times.
+        self.failUnless(abs(from_timestamp - from_now) <= tolerance)
+
+    def test_more_timetuple(self):
+        # This tests fields beyond those tested by the TestDate.test_timetuple.
+        t = self.theclass(2004, 12, 31, 6, 22, 33)
+        self.assertEqual(t.timetuple(), (2004, 12, 31, 6, 22, 33, 4, 366, -1))
+        self.assertEqual(t.timetuple(),
+                         (t.year, t.month, t.day,
+                          t.hour, t.minute, t.second,
+                          t.weekday(),
+                          t.toordinal() - date(t.year, 1, 1).toordinal() + 1,
+                          -1))
+        tt = t.timetuple()
+        self.assertEqual(tt.tm_year, t.year)
+        self.assertEqual(tt.tm_mon, t.month)
+        self.assertEqual(tt.tm_mday, t.day)
+        self.assertEqual(tt.tm_hour, t.hour)
+        self.assertEqual(tt.tm_min, t.minute)
+        self.assertEqual(tt.tm_sec, t.second)
+        self.assertEqual(tt.tm_wday, t.weekday())
+        self.assertEqual(tt.tm_yday, t.toordinal() -
+                                     date(t.year, 1, 1).toordinal() + 1)
+        self.assertEqual(tt.tm_isdst, -1)
+
+    def test_more_strftime(self):
+        # This tests fields beyond those tested by the TestDate.test_strftime.
+        t = self.theclass(2004, 12, 31, 6, 22, 33)
+        self.assertEqual(t.strftime("%m %d %y %S %M %H %j"),
+                                    "12 31 04 33 22 06 366")
+
+    def test_extract(self):
+        dt = self.theclass(2002, 3, 4, 18, 45, 3, 1234)
+        self.assertEqual(dt.date(), date(2002, 3, 4))
+        self.assertEqual(dt.time(), time(18, 45, 3, 1234))
+
+    def test_combine(self):
+        d = date(2002, 3, 4)
+        t = time(18, 45, 3, 1234)
+        expected = self.theclass(2002, 3, 4, 18, 45, 3, 1234)
+        combine = self.theclass.combine
+        dt = combine(d, t)
+        self.assertEqual(dt, expected)
+
+        dt = combine(time=t, date=d)
+        self.assertEqual(dt, expected)
+
+        self.assertEqual(d, dt.date())
+        self.assertEqual(t, dt.time())
+        self.assertEqual(dt, combine(dt.date(), dt.time()))
+
+        self.assertRaises(TypeError, combine) # need an arg
+        self.assertRaises(TypeError, combine, d) # need two args
+        self.assertRaises(TypeError, combine, t, d) # args reversed
+        self.assertRaises(TypeError, combine, d, t, 1) # too many args
+        self.assertRaises(TypeError, combine, "date", "time") # wrong types
+
+class TestTime(unittest.TestCase):
+
+    theclass = time
+
+    def test_basic_attributes(self):
+        t = self.theclass(12, 0)
+        self.assertEqual(t.hour, 12)
+        self.assertEqual(t.minute, 0)
+        self.assertEqual(t.second, 0)
+        self.assertEqual(t.microsecond, 0)
+
+    def test_basic_attributes_nonzero(self):
+        # Make sure all attributes are non-zero so bugs in
+        # bit-shifting access show up.
+        t = self.theclass(12, 59, 59, 8000)
+        self.assertEqual(t.hour, 12)
+        self.assertEqual(t.minute, 59)
+        self.assertEqual(t.second, 59)
+        self.assertEqual(t.microsecond, 8000)
+
+    def test_roundtrip(self):
+        t = self.theclass(1, 2, 3, 4)
+
+        # Verify t -> string -> time identity.
+        s = repr(t)
+        self.failUnless(s.startswith('datetime.'))
+        s = s[9:]
+        t2 = eval(s)
+        self.assertEqual(t, t2)
+
+        # Verify identity via reconstructing from pieces.
+        t2 = self.theclass(t.hour, t.minute, t.second,
+                           t.microsecond)
+        self.assertEqual(t, t2)
+
+    def test_comparing(self):
+        args = [1, 2, 3, 4]
+        t1 = self.theclass(*args)
+        t2 = self.theclass(*args)
+        self.failUnless(t1 == t2)
+        self.failUnless(t1 <= t2)
+        self.failUnless(t1 >= t2)
+        self.failUnless(not t1 != t2)
+        self.failUnless(not t1 < t2)
+        self.failUnless(not t1 > t2)
+        self.assertEqual(cmp(t1, t2), 0)
+        self.assertEqual(cmp(t2, t1), 0)
+
+        for i in range(len(args)):
+            newargs = args[:]
+            newargs[i] = args[i] + 1
+            t2 = self.theclass(*newargs)   # this is larger than t1
+            self.failUnless(t1 < t2)
+            self.failUnless(t2 > t1)
+            self.failUnless(t1 <= t2)
+            self.failUnless(t2 >= t1)
+            self.failUnless(t1 != t2)
+            self.failUnless(t2 != t1)
+            self.failUnless(not t1 == t2)
+            self.failUnless(not t2 == t1)
+            self.failUnless(not t1 > t2)
+            self.failUnless(not t2 < t1)
+            self.failUnless(not t1 >= t2)
+            self.failUnless(not t2 <= t1)
+            self.assertEqual(cmp(t1, t2), -1)
+            self.assertEqual(cmp(t2, t1), 1)
+
+        for badarg in (10, 10L, 34.5, "abc", {}, [], (), date(1, 1, 1),
+                       datetime(1, 1, 1, 1, 1), timedelta(9)):
+            self.assertRaises(TypeError, lambda: t1 == badarg)
+            self.assertRaises(TypeError, lambda: t1 != badarg)
+            self.assertRaises(TypeError, lambda: t1 <= badarg)
+            self.assertRaises(TypeError, lambda: t1 < badarg)
+            self.assertRaises(TypeError, lambda: t1 > badarg)
+            self.assertRaises(TypeError, lambda: t1 >= badarg)
+            self.assertRaises(TypeError, lambda: badarg == t1)
+            self.assertRaises(TypeError, lambda: badarg != t1)
+            self.assertRaises(TypeError, lambda: badarg <= t1)
+            self.assertRaises(TypeError, lambda: badarg < t1)
+            self.assertRaises(TypeError, lambda: badarg > t1)
+            self.assertRaises(TypeError, lambda: badarg >= t1)
+
+    def test_bad_constructor_arguments(self):
+        # bad hours
+        self.theclass(0, 0)    # no exception
+        self.theclass(23, 0)   # no exception
+        self.assertRaises(ValueError, self.theclass, -1, 0)
+        self.assertRaises(ValueError, self.theclass, 24, 0)
+        # bad minutes
+        self.theclass(23, 0)    # no exception
+        self.theclass(23, 59)   # no exception
+        self.assertRaises(ValueError, self.theclass, 23, -1)
+        self.assertRaises(ValueError, self.theclass, 23, 60)
+        # bad seconds
+        self.theclass(23, 59, 0)    # no exception
+        self.theclass(23, 59, 59)   # no exception
+        self.assertRaises(ValueError, self.theclass, 23, 59, -1)
+        self.assertRaises(ValueError, self.theclass, 23, 59, 60)
+        # bad microseconds
+        self.theclass(23, 59, 59, 0)        # no exception
+        self.theclass(23, 59, 59, 999999)   # no exception
+        self.assertRaises(ValueError, self.theclass, 23, 59, 59, -1)
+        self.assertRaises(ValueError, self.theclass, 23, 59, 59, 1000000)
+
+    def test_hash_equality(self):
+        d = self.theclass(23, 30, 17)
+        e = self.theclass(23, 30, 17)
+        self.assertEqual(d, e)
+        self.assertEqual(hash(d), hash(e))
+
+        dic = {d: 1}
+        dic[e] = 2
+        self.assertEqual(len(dic), 1)
+        self.assertEqual(dic[d], 2)
+        self.assertEqual(dic[e], 2)
+
+        d = self.theclass(0,  5, 17)
+        e = self.theclass(0,  5, 17)
+        self.assertEqual(d, e)
+        self.assertEqual(hash(d), hash(e))
+
+        dic = {d: 1}
+        dic[e] = 2
+        self.assertEqual(len(dic), 1)
+        self.assertEqual(dic[d], 2)
+        self.assertEqual(dic[e], 2)
+
+    def test_isoformat(self):
+        t = self.theclass(4, 5, 1, 123)
+        self.assertEqual(t.isoformat(), "04:05:01.000123")
+        self.assertEqual(t.isoformat(), str(t))
+
+        t = self.theclass()
+        self.assertEqual(t.isoformat(), "00:00:00")
+        self.assertEqual(t.isoformat(), str(t))
+
+        t = self.theclass(microsecond=1)
+        self.assertEqual(t.isoformat(), "00:00:00.000001")
+        self.assertEqual(t.isoformat(), str(t))
+
+        t = self.theclass(microsecond=10)
+        self.assertEqual(t.isoformat(), "00:00:00.000010")
+        self.assertEqual(t.isoformat(), str(t))
+
+        t = self.theclass(microsecond=100)
+        self.assertEqual(t.isoformat(), "00:00:00.000100")
+        self.assertEqual(t.isoformat(), str(t))
+
+        t = self.theclass(microsecond=1000)
+        self.assertEqual(t.isoformat(), "00:00:00.001000")
+        self.assertEqual(t.isoformat(), str(t))
+
+        t = self.theclass(microsecond=10000)
+        self.assertEqual(t.isoformat(), "00:00:00.010000")
+        self.assertEqual(t.isoformat(), str(t))
+
+        t = self.theclass(microsecond=100000)
+        self.assertEqual(t.isoformat(), "00:00:00.100000")
+        self.assertEqual(t.isoformat(), str(t))
+
+    def test_strftime(self):
+        t = self.theclass(1, 2, 3, 4)
+        self.assertEqual(t.strftime('%H %M %S'), "01 02 03")
+        # A naive object replaces %z and %Z with empty strings.
+        self.assertEqual(t.strftime("'%z' '%Z'"), "'' ''")
+
+    def test_str(self):
+        self.assertEqual(str(self.theclass(1, 2, 3, 4)), "01:02:03.000004")
+        self.assertEqual(str(self.theclass(10, 2, 3, 4000)), "10:02:03.004000")
+        self.assertEqual(str(self.theclass(0, 2, 3, 400000)), "00:02:03.400000")
+        self.assertEqual(str(self.theclass(12, 2, 3, 0)), "12:02:03")
+        self.assertEqual(str(self.theclass(23, 15, 0, 0)), "23:15:00")
+
+    def test_repr(self):
+        name = 'datetime.' + self.theclass.__name__
+        self.assertEqual(repr(self.theclass(1, 2, 3, 4)),
+                         "%s(1, 2, 3, 4)" % name)
+        self.assertEqual(repr(self.theclass(10, 2, 3, 4000)),
+                         "%s(10, 2, 3, 4000)" % name)
+        self.assertEqual(repr(self.theclass(0, 2, 3, 400000)),
+                         "%s(0, 2, 3, 400000)" % name)
+        self.assertEqual(repr(self.theclass(12, 2, 3, 0)),
+                         "%s(12, 2, 3)" % name)
+        self.assertEqual(repr(self.theclass(23, 15, 0, 0)),
+                         "%s(23, 15)" % name)
+
+    def test_resolution_info(self):
+        self.assert_(isinstance(self.theclass.min, self.theclass))
+        self.assert_(isinstance(self.theclass.max, self.theclass))
+        self.assert_(isinstance(self.theclass.resolution, timedelta))
+        self.assert_(self.theclass.max > self.theclass.min)
+
+    def test_pickling(self):
+        import pickle, cPickle
+        args = 20, 59, 16, 64**2
+        orig = self.theclass(*args)
+        state = orig.__getstate__()
+        self.assertEqual(state, '\x14\x3b\x10\x00\x10\x00')
+        derived = self.theclass()
+        derived.__setstate__(state)
+        self.assertEqual(orig, derived)
+        for pickler in pickle, cPickle:
+            for binary in 0, 1:
+                green = pickler.dumps(orig, binary)
+                derived = pickler.loads(green)
+                self.assertEqual(orig, derived)
+
+    def test_bool(self):
+        cls = self.theclass
+        self.failUnless(cls(1))
+        self.failUnless(cls(0, 1))
+        self.failUnless(cls(0, 0, 1))
+        self.failUnless(cls(0, 0, 0, 1))
+        self.failUnless(not cls(0))
+        self.failUnless(not cls())
+
+
+class TestTimeTZ(TestTime):
+
+    theclass = timetz
+
+    def test_empty(self):
+        t = self.theclass()
+        self.assertEqual(t.hour, 0)
+        self.assertEqual(t.minute, 0)
+        self.assertEqual(t.second, 0)
+        self.assertEqual(t.microsecond, 0)
+        self.failUnless(t.tzinfo is None)
+
+    def test_bad_tzinfo_classes(self):
+        tz = self.theclass
+        self.assertRaises(TypeError, tz, tzinfo=12)
+
+        class NiceTry(object):
+            def __init__(self): pass
+            def utcoffset(self, dt): pass
+        self.assertRaises(TypeError, tz, tzinfo=NiceTry)
+
+        class BetterTry(tzinfo):
+            def __init__(self): pass
+            def utcoffset(self, dt): pass
+        b = BetterTry()
+        t = tz(tzinfo=b)
+        self.failUnless(t.tzinfo is b)
+
+    def test_zones(self):
+        est = FixedOffset(-300, "EST", 1)
+        utc = FixedOffset(0, "UTC", -2)
+        met = FixedOffset(60, "MET", 3)
+        t1 = timetz( 7, 47, tzinfo=est)
+        t2 = timetz(12, 47, tzinfo=utc)
+        t3 = timetz(13, 47, tzinfo=met)
+        t4 = timetz(microsecond=40)
+        t5 = timetz(microsecond=40, tzinfo=utc)
+
+        self.assertEqual(t1.tzinfo, est)
+        self.assertEqual(t2.tzinfo, utc)
+        self.assertEqual(t3.tzinfo, met)
+        self.failUnless(t4.tzinfo is None)
+        self.assertEqual(t5.tzinfo, utc)
+
+        self.assertEqual(t1.utcoffset(), -300)
+        self.assertEqual(t2.utcoffset(), 0)
+        self.assertEqual(t3.utcoffset(), 60)
+        self.failUnless(t4.utcoffset() is None)
+        self.assertRaises(TypeError, t1.utcoffset, "no args")
+
+        self.assertEqual(t1.tzname(), "EST")
+        self.assertEqual(t2.tzname(), "UTC")
+        self.assertEqual(t3.tzname(), "MET")
+        self.failUnless(t4.tzname() is None)
+        self.assertRaises(TypeError, t1.tzname, "no args")
+
+        self.assertEqual(t1.dst(), 1)
+        self.assertEqual(t2.dst(), -2)
+        self.assertEqual(t3.dst(), 3)
+        self.failUnless(t4.dst() is None)
+        self.assertRaises(TypeError, t1.dst, "no args")
+
+        self.assertEqual(hash(t1), hash(t2))
+        self.assertEqual(hash(t1), hash(t3))
+        self.assertEqual(hash(t2), hash(t3))
+
+        self.assertEqual(t1, t2)
+        self.assertEqual(t1, t3)
+        self.assertEqual(t2, t3)
+        self.assertRaises(TypeError, lambda: t4 == t5) # mixed tz-aware & naive
+        self.assertRaises(TypeError, lambda: t4 < t5) # mixed tz-aware & naive
+        self.assertRaises(TypeError, lambda: t5 < t4) # mixed tz-aware & naive
+
+        self.assertEqual(str(t1), "07:47:00-05:00")
+        self.assertEqual(str(t2), "12:47:00+00:00")
+        self.assertEqual(str(t3), "13:47:00+01:00")
+        self.assertEqual(str(t4), "00:00:00.000040")
+        self.assertEqual(str(t5), "00:00:00.000040+00:00")
+
+        self.assertEqual(t1.isoformat(), "07:47:00-05:00")
+        self.assertEqual(t2.isoformat(), "12:47:00+00:00")
+        self.assertEqual(t3.isoformat(), "13:47:00+01:00")
+        self.assertEqual(t4.isoformat(), "00:00:00.000040")
+        self.assertEqual(t5.isoformat(), "00:00:00.000040+00:00")
+
+        d = 'datetime.timetz'
+        self.assertEqual(repr(t1), d + "(7, 47, tzinfo=est)")
+        self.assertEqual(repr(t2), d + "(12, 47, tzinfo=utc)")
+        self.assertEqual(repr(t3), d + "(13, 47, tzinfo=met)")
+        self.assertEqual(repr(t4), d + "(0, 0, 0, 40)")
+        self.assertEqual(repr(t5), d + "(0, 0, 0, 40, tzinfo=utc)")
+
+        self.assertEqual(t1.strftime("%H:%M:%S %%Z=%Z %%z=%z"),
+                                     "07:47:00 %Z=EST %z=-0500")
+        self.assertEqual(t2.strftime("%H:%M:%S %Z %z"), "12:47:00 UTC +0000")
+        self.assertEqual(t3.strftime("%H:%M:%S %Z %z"), "13:47:00 MET +0100")
+
+        yuck = FixedOffset(-1439, "%z %Z %%z%%Z")
+        t1 = timetz(23, 59, tzinfo=yuck)
+        self.assertEqual(t1.strftime("%H:%M %%Z='%Z' %%z='%z'"),
+                                     "23:59 %Z='%z %Z %%z%%Z' %z='-2359'")
+
+
+    def test_hash_edge_cases(self):
+        # Offsets that overflow a basic time.
+        t1 = self.theclass(0, 1, 2, 3, tzinfo=FixedOffset(1439, ""))
+        t2 = self.theclass(0, 0, 2, 3, tzinfo=FixedOffset(1438, ""))
+        self.assertEqual(hash(t1), hash(t2))
+
+        t1 = self.theclass(23, 58, 6, 100, tzinfo=FixedOffset(-1000, ""))
+        t2 = self.theclass(23, 48, 6, 100, tzinfo=FixedOffset(-1010, ""))
+        self.assertEqual(hash(t1), hash(t2))
+
+    def test_utc_offset_out_of_bounds(self):
+        class Edgy(tzinfo):
+            def __init__(self, offset):
+                self.offset = offset
+            def utcoffset(self, dt):
+                return self.offset
+
+        for offset, legit in ((-1440, False),
+                              (-1439, True),
+                              (1439, True),
+                              (1440, False)):
+            t = timetz(1, 2, 3, tzinfo=Edgy(offset))
+            if legit:
+                aofs = abs(offset)
+                h, m = divmod(aofs, 60)
+                tag = "%c%02d:%02d" % (offset < 0 and '-' or '+', h, m)
+                self.assertEqual(str(t), "01:02:03" + tag)
+            else:
+                self.assertRaises(ValueError, str, t)
+
+    def test_pickling(self):
+        import pickle, cPickle
+
+        # Try one without a tzinfo.
+        args = 20, 59, 16, 64**2
+        orig = self.theclass(*args)
+        state = orig.__getstate__()
+        self.assertEqual(state, ('\x14\x3b\x10\x00\x10\x00',))
+        derived = self.theclass()
+        derived.__setstate__(state)
+        self.assertEqual(orig, derived)
+        for pickler in pickle, cPickle:
+            for binary in 0, 1:
+                green = pickler.dumps(orig, binary)
+                derived = pickler.loads(green)
+                self.assertEqual(orig, derived)
+
+        # Try one with a tzinfo.
+        tinfo = FixedOffset(-300, 'cookie')
+        orig = self.theclass(5, 6, 7, tzinfo=tinfo)
+        state = orig.__getstate__()
+        derived = self.theclass()
+        derived.__setstate__(state)
+        self.assertEqual(orig, derived)
+        self.failUnless(isinstance(derived.tzinfo, FixedOffset))
+        self.assertEqual(derived.utcoffset(), -300)
+        self.assertEqual(derived.tzname(), 'cookie')
+
+        for pickler in pickle, cPickle:
+            for binary in 0, 1:
+                green = pickler.dumps(orig, binary)
+                derived = pickler.loads(green)
+                self.assertEqual(orig, derived)
+                self.failUnless(isinstance(derived.tzinfo, FixedOffset))
+                self.assertEqual(derived.utcoffset(), -300)
+                self.assertEqual(derived.tzname(), 'cookie')
+
+    def test_more_bool(self):
+        # Test cases with non-None tzinfo.
+        cls = self.theclass
+
+        t = cls(0, tzinfo=FixedOffset(-300, ""))
+        self.failUnless(t)
+
+        t = cls(5, tzinfo=FixedOffset(-300, ""))
+        self.failUnless(t)
+
+        t = cls(5, tzinfo=FixedOffset(300, ""))
+        self.failUnless(not t)
+
+        t = cls(23, 59, tzinfo=FixedOffset(23*60 + 59, ""))
+        self.failUnless(not t)
+
+        # Mostly ensuring this doesn't overflow internally.
+        t = cls(0, tzinfo=FixedOffset(23*60 + 59, ""))
+        self.failUnless(t)
+
+        # But this should yield a value error -- the utcoffset is bogus.
+        t = cls(0, tzinfo=FixedOffset(24*60, ""))
+        self.assertRaises(ValueError, lambda: bool(t))
+
+        # Likewise.
+        t = cls(0, tzinfo=FixedOffset(-24*60, ""))
+        self.assertRaises(ValueError, lambda: bool(t))
+
+class TestDateTimeTZ(TestDateTime):
+
+    theclass = datetimetz
+
+    def test_trivial(self):
+        dt = self.theclass(1, 2, 3, 4, 5, 6, 7)
+        self.assertEqual(dt.year, 1)
+        self.assertEqual(dt.month, 2)
+        self.assertEqual(dt.day, 3)
+        self.assertEqual(dt.hour, 4)
+        self.assertEqual(dt.minute, 5)
+        self.assertEqual(dt.second, 6)
+        self.assertEqual(dt.microsecond, 7)
+        self.assertEqual(dt.tzinfo, None)
+
+    def test_even_more_compare(self):
+        # The test_compare() and test_more_compare() inherited from TestDate
+        # and TestDateTime covered non-tzinfo cases.
+
+        # Smallest possible after UTC adjustment.
+        t1 = self.theclass(1, 1, 1, tzinfo=FixedOffset(1439, ""))
+        # Largest possible after UTC adjustment.
+        t2 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999999,
+                           tzinfo=FixedOffset(-1439, ""))
+
+        # Make sure those compare correctly, and w/o overflow.
+        self.failUnless(t1 < t2)
+        self.failUnless(t1 != t2)
+        self.failUnless(t2 > t1)
+
+        self.failUnless(t1 == t1)
+        self.failUnless(t2 == t2)
+
+        # Equal afer adjustment.
+        t1 = self.theclass(1, 12, 31, 23, 59, tzinfo=FixedOffset(1, ""))
+        t2 = self.theclass(2, 1, 1, 3, 13, tzinfo=FixedOffset(3*60+13+2, ""))
+        self.assertEqual(t1, t2)
+
+        # Change t1 not to subtract a minute, and t1 should be larger.
+        t1 = self.theclass(1, 12, 31, 23, 59, tzinfo=FixedOffset(0, ""))
+        self.failUnless(t1 > t2)
+
+        # Change t1 to subtract 2 minutes, and t1 should be smaller.
+        t1 = self.theclass(1, 12, 31, 23, 59, tzinfo=FixedOffset(2, ""))
+        self.failUnless(t1 < t2)
+
+        # Back to the original t1, but make seconds resolve it.
+        t1 = self.theclass(1, 12, 31, 23, 59, tzinfo=FixedOffset(1, ""),
+                           second=1)
+        self.failUnless(t1 > t2)
+
+        # Likewise, but make microseconds resolve it.
+        t1 = self.theclass(1, 12, 31, 23, 59, tzinfo=FixedOffset(1, ""),
+                           microsecond=1)
+        self.failUnless(t1 > t2)
+
+        # Make t2 naive and it should fail.
+        t2 = self.theclass.min
+        self.assertRaises(TypeError, lambda: t1 == t2)
+        self.assertEqual(t2, t2)
+
+        # It's also naive if it has tzinfo but tzinfo.utcoffset() is None.
+        class Naive(tzinfo):
+            def utcoffset(self, dt): return None
+        t2 = self.theclass(5, 6, 7, tzinfo=Naive())
+        self.assertRaises(TypeError, lambda: t1 == t2)
+        self.assertEqual(t2, t2)
+
+        # OTOH, it's OK to compare two of these mixing the two ways of being
+        # naive.
+        t1 = self.theclass(5, 6, 7)
+        self.assertEqual(t1, t2)
+
+        # Try a bogus uctoffset.
+        class Bogus(tzinfo):
+            def utcoffset(self, dt): return 1440 # out of bounds
+        t1 = self.theclass(2, 2, 2, tzinfo=Bogus())
+        t2 = self.theclass(2, 2, 2, tzinfo=FixedOffset(0, ""))
+        self.assertRaises(ValueError, lambda: t1 == t1)
+
+    def test_bad_tzinfo_classes(self):
+        tz = self.theclass
+        self.assertRaises(TypeError, tz, 1, 2, 3, tzinfo=12)
+
+        class NiceTry(object):
+            def __init__(self): pass
+            def utcoffset(self, dt): pass
+        self.assertRaises(TypeError, tz, 1, 2, 3, tzinfo=NiceTry)
+
+        class BetterTry(tzinfo):
+            def __init__(self): pass
+            def utcoffset(self, dt): pass
+        b = BetterTry()
+        t = tz(1, 2, 3, tzinfo=b)
+        self.failUnless(t.tzinfo is b)
+
+    def test_pickling(self):
+        import pickle, cPickle
+
+        # Try one without a tzinfo.
+        args = 6, 7, 23, 20, 59, 1, 64**2
+        orig = self.theclass(*args)
+        state = orig.__getstate__()
+        self.assertEqual(state, ('\x00\x06\x07\x17\x14\x3b\x01\x00\x10\x00',))
+        derived = self.theclass(1, 1, 1)
+        derived.__setstate__(state)
+        self.assertEqual(orig, derived)
+        for pickler in pickle, cPickle:
+            for binary in 0, 1:
+                green = pickler.dumps(orig, binary)
+                derived = pickler.loads(green)
+                self.assertEqual(orig, derived)
+
+        # Try one with a tzinfo.
+        tinfo = FixedOffset(-300, 'cookie')
+        orig = self.theclass(*args, **{'tzinfo': tinfo})
+        state = orig.__getstate__()
+        derived = self.theclass(1, 1, 1)
+        derived.__setstate__(state)
+        self.assertEqual(orig, derived)
+        self.failUnless(isinstance(derived.tzinfo, FixedOffset))
+        self.assertEqual(derived.utcoffset(), -300)
+        self.assertEqual(derived.tzname(), 'cookie')
+
+        for pickler in pickle, cPickle:
+            for binary in 0, 1:
+                green = pickler.dumps(orig, binary)
+                derived = pickler.loads(green)
+                self.assertEqual(orig, derived)
+                self.failUnless(isinstance(derived.tzinfo, FixedOffset))
+                self.assertEqual(derived.utcoffset(), -300)
+                self.assertEqual(derived.tzname(), 'cookie')
+
+    def test_extreme_hashes(self):
+        # If an attempt is made to hash these via subtracting the offset
+        # then hashing a datetime object, OverflowError results.  The
+        # Python implementation used to blow up here.
+        t = self.theclass(1, 1, 1, tzinfo=FixedOffset(1439, ""))
+        hash(t)
+        t = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999999,
+                          tzinfo=FixedOffset(-1439, ""))
+        hash(t)
+
+        # OTOH, an OOB offset should blow up.
+        t = self.theclass(5, 5, 5, tzinfo=FixedOffset(-1440, ""))
+        self.assertRaises(ValueError, hash, t)
+
+    def test_zones(self):
+        est = FixedOffset(-300, "EST")
+        utc = FixedOffset(0, "UTC")
+        met = FixedOffset(60, "MET")
+        t1 = datetimetz(2002, 3, 19,  7, 47, tzinfo=est)
+        t2 = datetimetz(2002, 3, 19, 12, 47, tzinfo=utc)
+        t3 = datetimetz(2002, 3, 19, 13, 47, tzinfo=met)
+        self.assertEqual(t1.tzinfo, est)
+        self.assertEqual(t2.tzinfo, utc)
+        self.assertEqual(t3.tzinfo, met)
+        self.assertEqual(t1.utcoffset(), -300)
+        self.assertEqual(t2.utcoffset(), 0)
+        self.assertEqual(t3.utcoffset(), 60)
+        self.assertEqual(t1.tzname(), "EST")
+        self.assertEqual(t2.tzname(), "UTC")
+        self.assertEqual(t3.tzname(), "MET")
+        self.assertEqual(hash(t1), hash(t2))
+        self.assertEqual(hash(t1), hash(t3))
+        self.assertEqual(hash(t2), hash(t3))
+        self.assertEqual(t1, t2)
+        self.assertEqual(t1, t3)
+        self.assertEqual(t2, t3)
+        self.assertEqual(str(t1), "2002-03-19 07:47:00-05:00")
+        self.assertEqual(str(t2), "2002-03-19 12:47:00+00:00")
+        self.assertEqual(str(t3), "2002-03-19 13:47:00+01:00")
+        d = 'datetime.datetimetz(2002, 3, 19, '
+        self.assertEqual(repr(t1), d + "7, 47, tzinfo=est)")
+        self.assertEqual(repr(t2), d + "12, 47, tzinfo=utc)")
+        self.assertEqual(repr(t3), d + "13, 47, tzinfo=met)")
+
+    def test_combine(self):
+        met = FixedOffset(60, "MET")
+        d = date(2002, 3, 4)
+        tz = timetz(18, 45, 3, 1234, tzinfo=met)
+        dt = datetimetz.combine(d, tz)
+        self.assertEqual(dt, datetimetz(2002, 3, 4, 18, 45, 3, 1234,
+                                        tzinfo=met))
+
+    def test_extract(self):
+        met = FixedOffset(60, "MET")
+        dt = self.theclass(2002, 3, 4, 18, 45, 3, 1234, tzinfo=met)
+        self.assertEqual(dt.date(), date(2002, 3, 4))
+        self.assertEqual(dt.time(), time(18, 45, 3, 1234))
+        self.assertEqual(dt.timetz(), timetz(18, 45, 3, 1234, tzinfo=met))
+
+    def test_tz_aware_arithmetic(self):
+        import random
+
+        now = self.theclass.now()
+        tz55 = FixedOffset(-330, "west 5:30")
+        timeaware = timetz(now.hour, now.minute, now.second,
+                           now.microsecond, tzinfo=tz55)
+        nowaware = self.theclass.combine(now.date(), timeaware)
+        self.failUnless(nowaware.tzinfo is tz55)
+        self.assertEqual(nowaware.timetz(), timeaware)
+
+        # Can't mix aware and non-aware.
+        self.assertRaises(TypeError, lambda: now - nowaware)
+        self.assertRaises(TypeError, lambda: nowaware - now)
+
+        # And adding datetimetz's doesn't make sense, aware or not.
+        self.assertRaises(TypeError, lambda: now + nowaware)
+        self.assertRaises(TypeError, lambda: nowaware + now)
+        self.assertRaises(TypeError, lambda: nowaware + nowaware)
+
+        # Subtracting should yield 0.
+        self.assertEqual(now - now, timedelta(0))
+        self.assertEqual(nowaware - nowaware, timedelta(0))
+
+        # Adding a delta should preserve tzinfo.
+        delta = timedelta(weeks=1, minutes=12, microseconds=5678)
+        nowawareplus = nowaware + delta
+        self.failUnless(nowaware.tzinfo is tz55)
+        nowawareplus2 = delta + nowaware
+        self.failUnless(nowawareplus2.tzinfo is tz55)
+        self.assertEqual(nowawareplus, nowawareplus2)
+
+        # that - delta should be what we started with, and that - what we
+        # started with should be delta.
+        diff = nowawareplus - delta
+        self.failUnless(diff.tzinfo is tz55)
+        self.assertEqual(nowaware, diff)
+        self.assertRaises(TypeError, lambda: delta - nowawareplus)
+        self.assertEqual(nowawareplus - nowaware, delta)
+
+        # Make up a random timezone.
+        tzr = FixedOffset(random.randrange(-1439, 1440), "randomtimezone")
+        # Attach it to nowawareplus -- this is clumsy.
+        nowawareplus = self.theclass.combine(nowawareplus.date(),
+                                             timetz(nowawareplus.hour,
+                                                    nowawareplus.minute,
+                                                    nowawareplus.second,
+                                                    nowawareplus.microsecond,
+                                                    tzinfo=tzr))
+        self.failUnless(nowawareplus.tzinfo is tzr)
+        # Make sure the difference takes the timezone adjustments into account.
+        got = nowaware - nowawareplus
+        # Expected:  (nowaware base - nowaware offset) -
+        #            (nowawareplus base - nowawareplus offset) =
+        #            (nowaware base - nowawareplus base) +
+        #            (nowawareplus offset - nowaware offset) =
+        #            -delta + nowawareplus offset - nowaware offset
+        expected = timedelta(minutes=nowawareplus.utcoffset() -
+                                     nowaware.utcoffset()) - delta
+        self.assertEqual(got, expected)
+
+        # Try max possible difference.
+        min = self.theclass(1, 1, 1, tzinfo=FixedOffset(1439, "min"))
+        max = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999999,
+                            tzinfo=FixedOffset(-1439, "max"))
+        maxdiff = max - min
+        self.assertEqual(maxdiff, self.theclass.max - self.theclass.min +
+                                  timedelta(minutes=2*1439))
+
+    def test_tzinfo_now(self):
+        meth = self.theclass.now
+        # Ensure it doesn't require tzinfo (i.e., that this doesn't blow up).
+        base = meth()
+        # Try with and without naming the keyword.
+        off42 = FixedOffset(42, "42")
+        another = meth(off42)
+        again = meth(tzinfo=off42)
+        self.failUnless(another.tzinfo is again.tzinfo)
+        self.assertEqual(another.utcoffset(), 42)
+        # Bad argument with and w/o naming the keyword.
+        self.assertRaises(TypeError, meth, 16)
+        self.assertRaises(TypeError, meth, tzinfo=16)
+        # Bad keyword name.
+        self.assertRaises(TypeError, meth, tinfo=off42)
+        # Too many args.
+        self.assertRaises(TypeError, meth, off42, off42)
+
+    def test_tzinfo_fromtimestamp(self):
+        import time
+        meth = self.theclass.fromtimestamp
+        ts = time.time()
+        # Ensure it doesn't require tzinfo (i.e., that this doesn't blow up).
+        base = meth(ts)
+        # Try with and without naming the keyword.
+        off42 = FixedOffset(42, "42")
+        another = meth(ts, off42)
+        again = meth(ts, tzinfo=off42)
+        self.failUnless(another.tzinfo is again.tzinfo)
+        self.assertEqual(another.utcoffset(), 42)
+        # Bad argument with and w/o naming the keyword.
+        self.assertRaises(TypeError, meth, ts, 16)
+        self.assertRaises(TypeError, meth, ts, tzinfo=16)
+        # Bad keyword name.
+        self.assertRaises(TypeError, meth, ts, tinfo=off42)
+        # Too many args.
+        self.assertRaises(TypeError, meth, ts, off42, off42)
+        # Too few args.
+        self.assertRaises(TypeError, meth)
+
+    def test_tzinfo_utcnow(self):
+        meth = self.theclass.utcnow
+        # Ensure it doesn't require tzinfo (i.e., that this doesn't blow up).
+        base = meth()
+        # Try with and without naming the keyword; for whatever reason,
+        # utcnow() doesn't accept a tzinfo argument.
+        off42 = FixedOffset(42, "42")
+        self.assertRaises(TypeError, meth, off42)
+        self.assertRaises(TypeError, meth, tzinfo=off42)
+
+    def test_tzinfo_utcfromtimestamp(self):
+        import time
+        meth = self.theclass.utcfromtimestamp
+        ts = time.time()
+        # Ensure it doesn't require tzinfo (i.e., that this doesn't blow up).
+        base = meth(ts)
+        # Try with and without naming the keyword; for whatever reason,
+        # utcfromtimestamp() doesn't accept a tzinfo argument.
+        off42 = FixedOffset(42, "42")
+        self.assertRaises(TypeError, meth, ts, off42)
+        self.assertRaises(TypeError, meth, ts, tzinfo=off42)
+
+    def test_tzinfo_timetuple(self):
+        # TestDateTime tested most of this.  datetimetz adds a twist to the
+        # DST flag.
+        class DST(tzinfo):
+            def __init__(self, dstvalue):
+                self.dstvalue = dstvalue
+            def dst(self, dt):
+                return self.dstvalue
+
+        cls = self.theclass
+        for dstvalue, flag in (-33, 1), (33, 1), (0, 0), (None, -1):
+            d = cls(1, 1, 1, 10, 20, 30, 40, tzinfo=DST(dstvalue))
+            t = d.timetuple()
+            self.assertEqual(1, t.tm_year)
+            self.assertEqual(1, t.tm_mon)
+            self.assertEqual(1, t.tm_mday)
+            self.assertEqual(10, t.tm_hour)
+            self.assertEqual(20, t.tm_min)
+            self.assertEqual(30, t.tm_sec)
+            self.assertEqual(0, t.tm_wday)
+            self.assertEqual(1, t.tm_yday)
+            self.assertEqual(flag, t.tm_isdst)
+
+        # dst() returns wrong type.
+        self.assertRaises(TypeError, cls(1, 1, 1, tzinfo=DST("x")).timetuple)
+
+        # dst() at the edge.
+        self.assertEqual(cls(1,1,1, tzinfo=DST(1439)).timetuple().tm_isdst, 1)
+        self.assertEqual(cls(1,1,1, tzinfo=DST(-1439)).timetuple().tm_isdst, 1)
+
+        # dst() out of range.
+        self.assertRaises(ValueError, cls(1,1,1, tzinfo=DST(1440)).timetuple)
+        self.assertRaises(ValueError, cls(1,1,1, tzinfo=DST(-1440)).timetuple)
+
+    def test_utctimetuple(self):
+        class DST(tzinfo):
+            def __init__(self, dstvalue):
+                self.dstvalue = dstvalue
+            def dst(self, dt):
+                return self.dstvalue
+
+        cls = self.theclass
+        # This can't work:  DST didn't implement utcoffset.
+        self.assertRaises(NotImplementedError,
+                          cls(1, 1, 1, tzinfo=DST(0)).utcoffset)
+
+        class UOFS(DST):
+            def __init__(self, uofs, dofs=None):
+                DST.__init__(self, dofs)
+                self.uofs = uofs
+            def utcoffset(self, dt):
+                return self.uofs
+
+        # Ensure tm_isdst is 0 regardless of what dst() says:  DST is never
+        # in effect for a UTC time.
+        for dstvalue in -33, 33, 0, None:
+            d = cls(1, 2, 3, 10, 20, 30, 40, tzinfo=UOFS(-53, dstvalue))
+            t = d.utctimetuple()
+            self.assertEqual(d.year, t.tm_year)
+            self.assertEqual(d.month, t.tm_mon)
+            self.assertEqual(d.day, t.tm_mday)
+            self.assertEqual(11, t.tm_hour) # 20mm + 53mm = 1hn + 13mm
+            self.assertEqual(13, t.tm_min)
+            self.assertEqual(d.second, t.tm_sec)
+            self.assertEqual(d.weekday(), t.tm_wday)
+            self.assertEqual(d.toordinal() - date(1, 1, 1).toordinal() + 1,
+                             t.tm_yday)
+            self.assertEqual(0, t.tm_isdst)
+
+        # At the edges, UTC adjustment can normalize into years out-of-range
+        # for a datetime object.  Ensure that a correct timetuple is
+        # created anyway.
+        tiny = cls(MINYEAR, 1, 1, 0, 0, 37, tzinfo=UOFS(1439))
+        # That goes back 1 minute less than a full day.
+        t = tiny.utctimetuple()
+        self.assertEqual(t.tm_year, MINYEAR-1)
+        self.assertEqual(t.tm_mon, 12)
+        self.assertEqual(t.tm_mday, 31)
+        self.assertEqual(t.tm_hour, 0)
+        self.assertEqual(t.tm_min, 1)
+        self.assertEqual(t.tm_sec, 37)
+        self.assertEqual(t.tm_yday, 366)    # "year 0" is a leap year
+        self.assertEqual(t.tm_isdst, 0)
+
+        huge = cls(MAXYEAR, 12, 31, 23, 59, 37, 999999, tzinfo=UOFS(-1439))
+        # That goes forward 1 minute less than a full day.
+        t = huge.utctimetuple()
+        self.assertEqual(t.tm_year, MAXYEAR+1)
+        self.assertEqual(t.tm_mon, 1)
+        self.assertEqual(t.tm_mday, 1)
+        self.assertEqual(t.tm_hour, 23)
+        self.assertEqual(t.tm_min, 58)
+        self.assertEqual(t.tm_sec, 37)
+        self.assertEqual(t.tm_yday, 1)
+        self.assertEqual(t.tm_isdst, 0)
+
+    def test_tzinfo_isoformat(self):
+        zero = FixedOffset(0, "+00:00")
+        plus = FixedOffset(220, "+03:40")
+        minus = FixedOffset(-231, "-03:51")
+        unknown = FixedOffset(None, "")
+
+        cls = self.theclass
+        datestr = '0001-02-03'
+        for ofs in None, zero, plus, minus, unknown:
+             for us in 0, 987001:
+                d = cls(1, 2, 3, 4, 5, 59, us, tzinfo=ofs)
+                timestr = '04:05:59' + (us and '.987001' or '')
+                ofsstr = ofs is not None and d.tzname() or ''
+                tailstr = timestr + ofsstr
+                iso = d.isoformat()
+                self.assertEqual(iso, datestr + 'T' + tailstr)
+                self.assertEqual(iso, d.isoformat('T'))
+                self.assertEqual(d.isoformat('k'), datestr + 'k' + tailstr)
+                self.assertEqual(str(d), datestr + ' ' + tailstr)
+
+
+def suite():
+    allsuites = [unittest.makeSuite(klass, 'test')
+                 for klass in (TestModule,
+                               TestTZInfo,
+                               TestTimeDelta,
+                               TestDateOnly,
+                               TestDate,
+                               TestDateTime,
+                               TestTime,
+                               TestTimeTZ,
+                               TestDateTimeTZ,
+                              )
+                ]
+    return unittest.TestSuite(allsuites)
+
+def test_main():
+    import gc
+    import sys
+
+    thesuite = suite()
+    lastrc = None
+    while True:
+        test_support.run_suite(thesuite)
+        if 1:       # change to 0, under a debug build, for some leak detection
+            break
+        gc.collect()
+        if gc.garbage:
+            raise SystemError("gc.garbage not empty after test run: %r" %
+                              gc.garbage)
+        if hasattr(sys, 'gettotalrefcount'):
+            thisrc = sys.gettotalrefcount()
+            print >> sys.stderr, '*' * 10, 'total refs:', thisrc,
+            if lastrc:
+                print >> sys.stderr, 'delta:', thisrc - lastrc
+            else:
+                print >> sys.stderr
+            lastrc = thisrc
+
+if __name__ == "__main__":
+    test_main()
diff --git a/Modules/datetimemodule.c b/Modules/datetimemodule.c
new file mode 100644
index 0000000..58af972
--- /dev/null
+++ b/Modules/datetimemodule.c
@@ -0,0 +1,5075 @@
+/*  C implementation for the date/time type documented at
+ *  http://www.zope.org/Members/fdrake/DateTimeWiki/FrontPage
+ */
+
+#include "Python.h"
+#include "modsupport.h"
+#include "structmember.h"
+
+#include <time.h>
+
+#include "datetime.h"
+
+/* We require that C int be at least 32 bits, and use int virtually
+ * everywhere.  In just a few cases we use a temp long, where a Python
+ * API returns a C long.  In such cases, we have to ensure that the
+ * final result fits in a C int (this can be an issue on 64-bit boxes).
+ */
+#if SIZEOF_INT < 4
+#	error "datetime.c requires that C int have at least 32 bits"
+#endif
+
+#define MINYEAR 1
+#define MAXYEAR 9999
+
+/* Nine decimal digits is easy to communicate, and leaves enough room
+ * so that two delta days can be added w/o fear of overflowing a signed
+ * 32-bit int, and with plenty of room left over to absorb any possible
+ * carries from adding seconds.
+ */
+#define MAX_DELTA_DAYS 999999999
+
+/* Rename the long macros in datetime.h to more reasonable short names. */
+#define GET_YEAR		PyDateTime_GET_YEAR
+#define GET_MONTH		PyDateTime_GET_MONTH
+#define GET_DAY			PyDateTime_GET_DAY
+#define DATE_GET_HOUR		PyDateTime_DATE_GET_HOUR
+#define DATE_GET_MINUTE		PyDateTime_DATE_GET_MINUTE
+#define DATE_GET_SECOND		PyDateTime_DATE_GET_SECOND
+#define DATE_GET_MICROSECOND	PyDateTime_DATE_GET_MICROSECOND
+
+/* Date accessors for date and datetime. */
+#define SET_YEAR(o, v)		(((o)->data[0] = ((v) & 0xff00) >> 8), \
+                                 ((o)->data[1] = ((v) & 0x00ff)))
+#define SET_MONTH(o, v)		(PyDateTime_GET_MONTH(o) = (v))
+#define SET_DAY(o, v)		(PyDateTime_GET_DAY(o) = (v))
+
+/* Date/Time accessors for datetime. */
+#define DATE_SET_HOUR(o, v)	(PyDateTime_DATE_GET_HOUR(o) = (v))
+#define DATE_SET_MINUTE(o, v)	(PyDateTime_DATE_GET_MINUTE(o) = (v))
+#define DATE_SET_SECOND(o, v)	(PyDateTime_DATE_GET_SECOND(o) = (v))
+#define DATE_SET_MICROSECOND(o, v)	\
+	(((o)->data[7] = ((v) & 0xff0000) >> 16), \
+         ((o)->data[8] = ((v) & 0x00ff00) >> 8), \
+         ((o)->data[9] = ((v) & 0x0000ff)))
+
+/* Time accessors for time. */
+#define TIME_GET_HOUR		PyDateTime_TIME_GET_HOUR
+#define TIME_GET_MINUTE		PyDateTime_TIME_GET_MINUTE
+#define TIME_GET_SECOND		PyDateTime_TIME_GET_SECOND
+#define TIME_GET_MICROSECOND	PyDateTime_TIME_GET_MICROSECOND
+#define TIME_SET_HOUR(o, v)	(PyDateTime_TIME_GET_HOUR(o) = (v))
+#define TIME_SET_MINUTE(o, v)	(PyDateTime_TIME_GET_MINUTE(o) = (v))
+#define TIME_SET_SECOND(o, v)	(PyDateTime_TIME_GET_SECOND(o) = (v))
+#define TIME_SET_MICROSECOND(o, v)	\
+	(((o)->data[3] = ((v) & 0xff0000) >> 16), \
+         ((o)->data[4] = ((v) & 0x00ff00) >> 8), \
+         ((o)->data[5] = ((v) & 0x0000ff)))
+
+/* Delta accessors for timedelta. */
+#define GET_TD_DAYS(o)		(((PyDateTime_Delta *)(o))->days)
+#define GET_TD_SECONDS(o)	(((PyDateTime_Delta *)(o))->seconds)
+#define GET_TD_MICROSECONDS(o)	(((PyDateTime_Delta *)(o))->microseconds)
+
+#define SET_TD_DAYS(o, v)	((o)->days = (v))
+#define SET_TD_SECONDS(o, v)	((o)->seconds = (v))
+#define SET_TD_MICROSECONDS(o, v) ((o)->microseconds = (v))
+
+/* Forward declarations. */
+static PyTypeObject PyDateTime_DateType;
+static PyTypeObject PyDateTime_DateTimeType;
+static PyTypeObject PyDateTime_DateTimeTZType;
+static PyTypeObject PyDateTime_DeltaType;
+static PyTypeObject PyDateTime_TimeType;
+static PyTypeObject PyDateTime_TZInfoType;
+static PyTypeObject PyDateTime_TimeTZType;
+
+/* ---------------------------------------------------------------------------
+ * Math utilities.
+ */
+
+/* k = i+j overflows iff k differs in sign from both inputs,
+ * iff k^i has sign bit set and k^j has sign bit set,
+ * iff (k^i)&(k^j) has sign bit set.
+ */
+#define SIGNED_ADD_OVERFLOWED(RESULT, I, J) \
+	((((RESULT) ^ (I)) & ((RESULT) ^ (J))) < 0)
+
+/* Compute Python divmod(x, y), returning the quotient and storing the
+ * remainder into *r.  The quotient is the floor of x/y, and that's
+ * the real point of this.  C will probably truncate instead (C99
+ * requires truncation; C89 left it implementation-defined).
+ * Simplification:  we *require* that y > 0 here.  That's appropriate
+ * for all the uses made of it.  This simplifies the code and makes
+ * the overflow case impossible (divmod(LONG_MIN, -1) is the only
+ * overflow case).
+ */
+static int
+divmod(int x, int y, int *r)
+{
+	int quo;
+
+	assert(y > 0);
+	quo = x / y;
+	*r = x - quo * y;
+	if (*r < 0) {
+		--quo;
+		*r += y;
+	}
+	assert(0 <= *r && *r < y);
+	return quo;
+}
+
+/* ---------------------------------------------------------------------------
+ * General calendrical helper functions
+ */
+
+/* For each month ordinal in 1..12, the number of days in that month,
+ * and the number of days before that month in the same year.  These
+ * are correct for non-leap years only.
+ */
+static int _days_in_month[] = {
+	0, /* unused; this vector uses 1-based indexing */
+	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+static int _days_before_month[] = {
+	0, /* unused; this vector uses 1-based indexing */
+	0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
+};
+
+/* year -> 1 if leap year, else 0. */
+static int
+is_leap(int year)
+{
+	/* Cast year to unsigned.  The result is the same either way, but
+	 * C can generate faster code for unsigned mod than for signed
+	 * mod (especially for % 4 -- a good compiler should just grab
+	 * the last 2 bits when the LHS is unsigned).
+	 */
+	const unsigned int ayear = (unsigned int)year;
+	return ayear % 4 == 0 && (ayear % 100 != 0 || ayear % 400 == 0);
+}
+
+/* year, month -> number of days in that month in that year */
+static int
+days_in_month(int year, int month)
+{
+	assert(month >= 1);
+	assert(month <= 12);
+	if (month == 2 && is_leap(year))
+		return 29;
+	else
+		return _days_in_month[month];
+}
+
+/* year, month -> number of days in year preceeding first day of month */
+static int
+days_before_month(int year, int month)
+{
+	int days;
+
+	assert(month >= 1);
+	assert(month <= 12);
+	days = _days_before_month[month];
+	if (month > 2 && is_leap(year))
+		++days;
+	return days;
+}
+
+/* year -> number of days before January 1st of year.  Remember that we
+ * start with year 1, so days_before_year(1) == 0.
+ */
+static int
+days_before_year(int year)
+{
+	int y = year - 1;
+	/* This is incorrect if year <= 0; we really want the floor
+	 * here.  But so long as MINYEAR is 1, the smallest year this
+	 * can see is 0 (this can happen in some normalization endcases),
+	 * so we'll just special-case that.
+	 */
+	assert (year >= 0);
+	if (y >= 0)
+		return y*365 + y/4 - y/100 + y/400;
+	else {
+		assert(y == -1);
+		return -366;
+	}
+}
+
+/* Number of days in 4, 100, and 400 year cycles.  That these have
+ * the correct values is asserted in the module init function.
+ */
+#define DI4Y	1461	/* days_before_year(5); days in 4 years */
+#define DI100Y	36524	/* days_before_year(101); days in 100 years */
+#define DI400Y	146097	/* days_before_year(401); days in 400 years  */
+
+/* ordinal -> year, month, day, considering 01-Jan-0001 as day 1. */
+static void
+ord_to_ymd(int ordinal, int *year, int *month, int *day)
+{
+	int n, n1, n4, n100, n400, leapyear, preceding;
+
+	/* ordinal is a 1-based index, starting at 1-Jan-1.  The pattern of
+	 * leap years repeats exactly every 400 years.  The basic strategy is
+	 * to find the closest 400-year boundary at or before ordinal, then
+	 * work with the offset from that boundary to ordinal.  Life is much
+	 * clearer if we subtract 1 from ordinal first -- then the values
+	 * of ordinal at 400-year boundaries are exactly those divisible
+	 * by DI400Y:
+	 *
+	 *    D  M   Y            n              n-1
+	 *    -- --- ----        ----------     ----------------
+	 *    31 Dec -400        -DI400Y       -DI400Y -1
+	 *     1 Jan -399         -DI400Y +1   -DI400Y      400-year boundary
+	 *    ...
+	 *    30 Dec  000        -1             -2
+	 *    31 Dec  000         0             -1
+	 *     1 Jan  001         1              0          400-year boundary
+	 *     2 Jan  001         2              1
+	 *     3 Jan  001         3              2
+	 *    ...
+	 *    31 Dec  400         DI400Y        DI400Y -1
+	 *     1 Jan  401         DI400Y +1     DI400Y      400-year boundary
+	 */
+	assert(ordinal >= 1);
+	--ordinal;
+	n400 = ordinal / DI400Y;
+	n = ordinal % DI400Y;
+	*year = n400 * 400 + 1;
+
+	/* Now n is the (non-negative) offset, in days, from January 1 of
+	 * year, to the desired date.  Now compute how many 100-year cycles
+	 * precede n.
+	 * Note that it's possible for n100 to equal 4!  In that case 4 full
+	 * 100-year cycles precede the desired day, which implies the
+	 * desired day is December 31 at the end of a 400-year cycle.
+	 */
+	n100 = n / DI100Y;
+	n = n % DI100Y;
+
+	/* Now compute how many 4-year cycles precede it. */
+	n4 = n / DI4Y;
+	n = n % DI4Y;
+
+	/* And now how many single years.  Again n1 can be 4, and again
+	 * meaning that the desired day is December 31 at the end of the
+	 * 4-year cycle.
+	 */
+	n1 = n / 365;
+	n = n % 365;
+
+	*year += n100 * 100 + n4 * 4 + n1;
+	if (n1 == 4 || n100 == 4) {
+		assert(n == 0);
+		*year -= 1;
+		*month = 12;
+		*day = 31;
+		return;
+	}
+
+	/* Now the year is correct, and n is the offset from January 1.  We
+	 * find the month via an estimate that's either exact or one too
+	 * large.
+	 */
+	leapyear = n1 == 3 && (n4 != 24 || n100 == 3);
+	assert(leapyear == is_leap(*year));
+	*month = (n + 50) >> 5;
+	preceding = (_days_before_month[*month] + (*month > 2 && leapyear));
+	if (preceding > n) {
+		/* estimate is too large */
+		*month -= 1;
+		preceding -= days_in_month(*year, *month);
+	}
+	n -= preceding;
+	assert(0 <= n);
+	assert(n < days_in_month(*year, *month));
+
+	*day = n + 1;
+}
+
+/* year, month, day -> ordinal, considering 01-Jan-0001 as day 1. */
+static int
+ymd_to_ord(int year, int month, int day)
+{
+	return days_before_year(year) + days_before_month(year, month) + day;
+}
+
+/* Day of week, where Monday==0, ..., Sunday==6.  1/1/1 was a Monday. */
+static int
+weekday(int year, int month, int day)
+{
+	return (ymd_to_ord(year, month, day) + 6) % 7;
+}
+
+/* Ordinal of the Monday starting week 1 of the ISO year.  Week 1 is the
+ * first calendar week containing a Thursday.
+ */
+static int
+iso_week1_monday(int year)
+{
+	int first_day = ymd_to_ord(year, 1, 1);	/* ord of 1/1 */
+	/* 0 if 1/1 is a Monday, 1 if a Tue, etc. */
+	int first_weekday = (first_day + 6) % 7;
+	/* ordinal of closest Monday at or before 1/1 */
+	int week1_monday  = first_day - first_weekday;
+
+	if (first_weekday > 3)	/* if 1/1 was Fri, Sat, Sun */
+		week1_monday += 7;
+	return week1_monday;
+}
+
+/* ---------------------------------------------------------------------------
+ * Range checkers.
+ */
+
+/* Check that -MAX_DELTA_DAYS <= days <= MAX_DELTA_DAYS.  If so, return 0.
+ * If not, raise OverflowError and return -1.
+ */
+static int
+check_delta_day_range(int days)
+{
+	if (-MAX_DELTA_DAYS <= days && days <= MAX_DELTA_DAYS)
+		return 0;
+	PyErr_Format(PyExc_OverflowError,
+		     "days=%d; must have magnitude <= %d",
+		     days);
+	return -1;
+}
+
+/* Check that date arguments are in range.  Return 0 if they are.  If they
+ * aren't, raise ValueError and return -1.
+ */
+static int
+check_date_args(int year, int month, int day)
+{
+
+	if (year < MINYEAR || year > MAXYEAR) {
+		PyErr_SetString(PyExc_ValueError,
+				"year is out of range");
+		return -1;
+	}
+	if (month < 1 || month > 12) {
+		PyErr_SetString(PyExc_ValueError,
+				"month must be in 1..12");
+		return -1;
+	}
+	if (day < 1 || day > days_in_month(year, month)) {
+		PyErr_SetString(PyExc_ValueError,
+				"day is out of range for month");
+		return -1;
+	}
+	return 0;
+}
+
+/* Check that time arguments are in range.  Return 0 if they are.  If they
+ * aren't, raise ValueError and return -1.
+ */
+static int
+check_time_args(int h, int m, int s, int us)
+{
+	if (h < 0 || h > 23) {
+		PyErr_SetString(PyExc_ValueError,
+				"hour must be in 0..23");
+		return -1;
+	}
+	if (m < 0 || m > 59) {
+		PyErr_SetString(PyExc_ValueError,
+				"minute must be in 0..59");
+		return -1;
+	}
+	if (s < 0 || s > 59) {
+		PyErr_SetString(PyExc_ValueError,
+				"second must be in 0..59");
+		return -1;
+	}
+	if (us < 0 || us > 999999) {
+		PyErr_SetString(PyExc_ValueError,
+				"microsecond must be in 0..999999");
+		return -1;
+	}
+	return 0;
+}
+
+/* ---------------------------------------------------------------------------
+ * Normalization utilities.
+ */
+
+/* One step of a mixed-radix conversion.  A "hi" unit is equivalent to
+ * factor "lo" units.  factor must be > 0.  If *lo is less than 0, or
+ * at least factor, enough of *lo is converted into "hi" units so that
+ * 0 <= *lo < factor.  The input values must be such that int overflow
+ * is impossible.
+ */
+static void
+normalize_pair(int *hi, int *lo, int factor)
+{
+	assert(factor > 0);
+	assert(lo != hi);
+	if (*lo < 0 || *lo >= factor) {
+		const int num_hi = divmod(*lo, factor, lo);
+		const int new_hi = *hi + num_hi;
+		assert(! SIGNED_ADD_OVERFLOWED(new_hi, *hi, num_hi));
+		*hi = new_hi;
+	}
+	assert(0 <= *lo && *lo < factor);
+}
+
+/* Fiddle days (d), seconds (s), and microseconds (us) so that
+ * 	0 <= *s < 24*3600
+ * 	0 <= *us < 1000000
+ * The input values must be such that the internals don't overflow.
+ * The way this routine is used, we don't get close.
+ */
+static void
+normalize_d_s_us(int *d, int *s, int *us)
+{
+	if (*us < 0 || *us >= 1000000) {
+		normalize_pair(s, us, 1000000);
+		/* |s| can't be bigger than about
+		 * |original s| + |original us|/1000000 now.
+		 */
+
+	}
+	if (*s < 0 || *s >= 24*3600) {
+		normalize_pair(d, s, 24*3600);
+		/* |d| can't be bigger than about
+		 * |original d| +
+		 * (|original s| + |original us|/1000000) / (24*3600) now.
+		 */
+	}
+	assert(0 <= *s && *s < 24*3600);
+	assert(0 <= *us && *us < 1000000);
+}
+
+/* Fiddle years (y), months (m), and days (d) so that
+ * 	1 <= *m <= 12
+ * 	1 <= *d <= days_in_month(*y, *m)
+ * The input values must be such that the internals don't overflow.
+ * The way this routine is used, we don't get close.
+ */
+static void
+normalize_y_m_d(int *y, int *m, int *d)
+{
+	int dim;	/* # of days in month */
+
+	/* This gets muddy:  the proper range for day can't be determined
+	 * without knowing the correct month and year, but if day is, e.g.,
+	 * plus or minus a million, the current month and year values make
+	 * no sense (and may also be out of bounds themselves).
+	 * Saying 12 months == 1 year should be non-controversial.
+	 */
+	if (*m < 1 || *m > 12) {
+		--*m;
+		normalize_pair(y, m, 12);
+		++*m;
+		/* |y| can't be bigger than about
+		 * |original y| + |original m|/12 now.
+		 */
+	}
+	assert(1 <= *m && *m <= 12);
+
+	/* Now only day can be out of bounds (year may also be out of bounds
+	 * for a datetime object, but we don't care about that here).
+	 * If day is out of bounds, what to do is arguable, but at least the
+	 * method here is principled and explainable.
+	 */
+	dim = days_in_month(*y, *m);
+	if (*d < 1 || *d > dim) {
+		/* Move day-1 days from the first of the month.  First try to
+		 * get off cheap if we're only one day out of range
+		 * (adjustments for timezone alone can't be worse than that).
+		 */
+		if (*d == 0) {
+			--*m;
+			if (*m > 0)
+				*d = days_in_month(*y, *m);
+			else {
+				--*y;
+				*m = 12;
+				*d = 31;
+			}
+		}
+		else if (*d == dim + 1) {
+			/* move forward a day */
+			++*m;
+			*d = 1;
+			if (*m > 12) {
+				*m = 1;
+				++*y;
+			}
+		}
+		else {
+			int ordinal = ymd_to_ord(*y, *m, 1) +
+						  *d - 1;
+			ord_to_ymd(ordinal, y, m, d);
+		}
+	}
+	assert(*m > 0);
+	assert(*d > 0);
+}
+
+/* Fiddle out-of-bounds months and days so that the result makes some kind
+ * of sense.  The parameters are both inputs and outputs.  Returns < 0 on
+ * failure, where failure means the adjusted year is out of bounds.
+ */
+static int
+normalize_date(int *year, int *month, int *day)
+{
+	int result;
+
+	normalize_y_m_d(year, month, day);
+	if (MINYEAR <= *year && *year <= MAXYEAR)
+		result = 0;
+	else {
+		PyErr_SetString(PyExc_OverflowError,
+				"date value out of range");
+		result = -1;
+	}
+	return result;
+}
+
+/* Force all the datetime fields into range.  The parameters are both
+ * inputs and outputs.  Returns < 0 on error.
+ */
+static int
+normalize_datetime(int *year, int *month, int *day,
+                   int *hour, int *minute, int *second,
+                   int *microsecond)
+{
+	normalize_pair(second, microsecond, 1000000);
+	normalize_pair(minute, second, 60);
+	normalize_pair(hour, minute, 60);
+	normalize_pair(day, hour, 24);
+	return normalize_date(year, month, day);
+}
+
+/* ---------------------------------------------------------------------------
+ * tzinfo helpers.
+ */
+
+/* If self has a tzinfo member, return a BORROWED reference to it.  Else
+ * return NULL, which is NOT AN ERROR.  There are no error returns here,
+ * and the caller must not decref the result.
+ */
+static PyObject *
+get_tzinfo_member(PyObject *self)
+{
+	PyObject *tzinfo = NULL;
+
+	if (PyDateTimeTZ_Check(self))
+		tzinfo = ((PyDateTime_DateTimeTZ *)self)->tzinfo;
+	else if (PyTimeTZ_Check(self))
+		tzinfo = ((PyDateTime_TimeTZ *)self)->tzinfo;
+
+	return tzinfo;
+}
+
+/* Ensure that p is None or of a tzinfo subclass.  Return 0 if OK; if not
+ * raise TypeError and return -1.
+ */
+static int
+check_tzinfo_subclass(PyObject *p)
+{
+	if (p == Py_None || PyTZInfo_Check(p))
+		return 0;
+	PyErr_Format(PyExc_TypeError,
+		     "tzinfo argument must be None or of a tzinfo subclass, "
+		     "not type '%s'",
+		     p->ob_type->tp_name);
+	return -1;
+}
+
+/* Internal helper.
+ * Call getattr(tzinfo, name)(tzinfoarg), and extract an int from the
+ * result.  tzinfo must be an instance of the tzinfo class.  If the method
+ * returns None, this returns 0 and sets *none to 1.  If the method doesn't
+ * return a Python int or long, TypeError is raised and this returns -1.
+ * If it does return an int or long, but is outside the valid range for
+ * a UTC minute offset, ValueError is raised and this returns -1.
+ * Else *none is set to 0 and the integer method result is returned.
+ */
+static int
+call_utc_tzinfo_method(PyObject *tzinfo, char *name, PyObject *tzinfoarg,
+		       int *none)
+{
+	PyObject *u;
+	long result = -1;	/* Py{Int,Long}_AsLong return long */
+
+	assert(tzinfo != NULL);
+	assert(PyTZInfo_Check(tzinfo));
+	assert(tzinfoarg != NULL);
+
+	*none = 0;
+	u = PyObject_CallMethod(tzinfo, name, "O", tzinfoarg);
+	if (u == NULL)
+		return -1;
+
+	if (u == Py_None) {
+		result = 0;
+		*none = 1;
+		goto Done;
+	}
+
+	if (PyInt_Check(u))
+		result = PyInt_AS_LONG(u);
+	else if (PyLong_Check(u))
+		result = PyLong_AsLong(u);
+	else {
+		PyErr_Format(PyExc_TypeError,
+			     "tzinfo.%s() must return None or int or long",
+			     name);
+		goto Done;
+	}
+
+Done:
+	Py_DECREF(u);
+	if (result < -1439 || result > 1439) {
+		PyErr_Format(PyExc_ValueError,
+			     "tzinfo.%s() returned %ld; must be in "
+			     "-1439 .. 1439",
+			     name, result);
+		result = -1;
+	}
+	return (int)result;
+}
+
+/* Call tzinfo.utcoffset(tzinfoarg), and extract an integer from the
+ * result.  tzinfo must be an instance of the tzinfo class.  If utcoffset()
+ * returns None, call_utcoffset returns 0 and sets *none to 1.  If uctoffset()
+ & doesn't return a Python int or long, TypeError is raised and this
+ * returns -1.  If utcoffset() returns an int outside the legitimate range
+ * for a UTC offset, ValueError is raised and this returns -1.  Else
+ * *none is set to 0 and the offset is returned.
+ */
+static int
+call_utcoffset(PyObject *tzinfo, PyObject *tzinfoarg, int *none)
+{
+	return call_utc_tzinfo_method(tzinfo, "utcoffset", tzinfoarg, none);
+}
+
+/* Call tzinfo.dst(tzinfoarg), and extract an integer from the
+ * result.  tzinfo must be an instance of the tzinfo class.  If dst()
+ * returns None, call_dst returns 0 and sets *none to 1.  If dst()
+ & doesn't return a Python int or long, TypeError is raised and this
+ * returns -1.  If dst() returns an int outside the legitimate range
+ * for a UTC offset, ValueError is raised and this returns -1.  Else
+ * *none is set to 0 and the offset is returned.
+ */
+static int
+call_dst(PyObject *tzinfo, PyObject *tzinfoarg, int *none)
+{
+	return call_utc_tzinfo_method(tzinfo, "dst", tzinfoarg, none);
+}
+
+/* Call tzinfo.tzname(tzinfoarg), and return the result.  tzinfo must be
+ * an instance of the tzinfo class.  If tzname() doesn't return None or
+ * a string, TypeError is raised and this returns NULL.
+ */
+static PyObject *
+call_tzname(PyObject *tzinfo, PyObject *tzinfoarg)
+{
+	PyObject *result;
+
+	assert(tzinfo != NULL);
+	assert(PyTZInfo_Check(tzinfo));
+	assert(tzinfoarg != NULL);
+
+	result = PyObject_CallMethod(tzinfo, "tzname", "O", tzinfoarg);
+	if (result != NULL && result != Py_None && !PyString_Check(result)) {
+		PyErr_Format(PyExc_TypeError, ".tzinfo.tzname() must "
+			     "return None or a string, not '%s'",
+			     result->ob_type->tp_name);
+		Py_DECREF(result);
+		result = NULL;
+	}
+	return result;
+}
+
+typedef enum {
+	      /* an exception has been set; the caller should pass it on */
+	      OFFSET_ERROR,
+
+	      /* type isn't date, datetime, datetimetz subclass, time, or
+	       * timetz subclass
+	       */
+	      OFFSET_UNKNOWN,
+
+	      /* date,
+	       * datetime,
+	       * datetimetz with None tzinfo,
+	       * datetimetz where utcoffset() return None
+	       * time,
+	       * timetz with None tzinfo,
+	       * timetz where utcoffset() returns None
+	       */
+	      OFFSET_NAIVE,
+
+	      /* timetz where utcoffset() doesn't return None,
+	       * datetimetz where utcoffset() doesn't return None
+	       */
+	      OFFSET_AWARE,
+} naivety;
+
+/* Classify a datetime object as to whether it's naive or offset-aware.  See
+ * the "naivety" typedef for details.  If the type is aware, *offset is set
+ * to minutes east of UTC (as returned by the tzinfo.utcoffset() method).
+ * If the type is offset-naive, *offset is set to 0.
+ */
+static naivety
+classify_object(PyObject *op, int *offset)
+{
+	int none;
+	PyObject *tzinfo;
+
+	*offset = 0;
+	if (PyDateTime_CheckExact(op) ||
+	    PyTime_CheckExact(op) ||
+	    PyDate_CheckExact(op))
+		return OFFSET_NAIVE;
+
+	tzinfo = get_tzinfo_member(op);	/* NULL means none, not error */
+	if (tzinfo == Py_None)
+		return OFFSET_NAIVE;
+	if (tzinfo == NULL)
+		return OFFSET_UNKNOWN;
+
+	*offset = call_utcoffset(tzinfo, op, &none);
+	if (*offset == -1 && PyErr_Occurred())
+		return OFFSET_ERROR;
+	return none ? OFFSET_NAIVE : OFFSET_AWARE;
+}
+
+/* repr is like "someclass(arg1, arg2)".  If tzinfo isn't None,
+ * stuff
+ *     ", tzinfo=" + repr(tzinfo)
+ * before the closing ")".
+ */
+static PyObject *
+append_keyword_tzinfo(PyObject *repr, PyObject *tzinfo)
+{
+	PyObject *temp;
+
+	assert(PyString_Check(repr));
+	assert(tzinfo);
+	if (tzinfo == Py_None)
+		return repr;
+	/* Get rid of the trailing ')'. */
+	assert(PyString_AsString(repr)[PyString_Size(repr)-1] == ')');
+	temp = PyString_FromStringAndSize(PyString_AsString(repr),
+					  PyString_Size(repr) - 1);
+	Py_DECREF(repr);
+	if (temp == NULL)
+		return NULL;
+	repr = temp;
+
+	/* Append ", tzinfo=". */
+	PyString_ConcatAndDel(&repr, PyString_FromString(", tzinfo="));
+
+	/* Append repr(tzinfo). */
+	PyString_ConcatAndDel(&repr, PyObject_Repr(tzinfo));
+
+	/* Add a closing paren. */
+	PyString_ConcatAndDel(&repr, PyString_FromString(")"));
+	return repr;
+}
+
+/* ---------------------------------------------------------------------------
+ * String format helpers.
+ */
+
+static PyObject *
+format_ctime(PyDateTime_Date *date,
+             int hours, int minutes, int seconds)
+{
+	static char *DayNames[] = {
+		"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"
+	};
+	static char *MonthNames[] = {
+		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+	};
+
+	char buffer[128];
+	int wday = weekday(GET_YEAR(date), GET_MONTH(date), GET_DAY(date));
+
+	PyOS_snprintf(buffer, sizeof(buffer), "%s %s %2d %02d:%02d:%02d %04d",
+		      DayNames[wday], MonthNames[GET_MONTH(date) - 1],
+		      GET_DAY(date), hours, minutes, seconds,
+		      GET_YEAR(date));
+	return PyString_FromString(buffer);
+}
+
+/* Add an hours & minutes UTC offset string to buf.  buf has no more than
+ * buflen bytes remaining.  The UTC offset is gotten by calling
+ * tzinfo.uctoffset(tzinfoarg).  If that returns None, \0 is stored into
+ * *buf, and that's all.  Else the returned value is checked for sanity (an
+ * integer in range), and if that's OK it's converted to an hours & minutes
+ * string of the form
+ *   sign HH sep MM
+ * Returns 0 if everything is OK.  If the return value from utcoffset() is
+ * bogus, an appropriate exception is set and -1 is returned.
+ */
+static int
+format_utcoffset(char *buf, int buflen, const char *sep,
+		PyObject *tzinfo, PyObject *tzinfoarg)
+{
+	int offset;
+	int hours;
+	int minutes;
+	char sign;
+	int none;
+
+	offset = call_utcoffset(tzinfo, tzinfoarg, &none);
+	if (offset == -1 && PyErr_Occurred())
+		return -1;
+	if (none) {
+		*buf = '\0';
+		return 0;
+	}
+	sign = '+';
+	if (offset < 0) {
+		sign = '-';
+		offset = - offset;
+	}
+	hours = divmod(offset, 60, &minutes);
+	PyOS_snprintf(buf, buflen, "%c%02d%s%02d", sign, hours, sep, minutes);
+	return 0;
+}
+
+/* I sure don't want to reproduce the strftime code from the time module,
+ * so this imports the module and calls it.  All the hair is due to
+ * giving special meanings to the %z and %Z format codes via a preprocessing
+ * step on the format string.
+ */
+static PyObject *
+wrap_strftime(PyObject *object, PyObject *format, PyObject *timetuple)
+{
+	PyObject *result = NULL;	/* guilty until proved innocent */
+
+	PyObject *zreplacement = NULL;	/* py string, replacement for %z */
+	PyObject *Zreplacement = NULL;	/* py string, replacement for %Z */
+
+	char *pin;	/* pointer to next char in input format */
+	char ch;	/* next char in input format */
+
+	PyObject *newfmt = NULL;	/* py string, the output format */
+	char *pnew;	/* pointer to available byte in output format */
+	char totalnew;	/* number bytes total in output format buffer,
+			   exclusive of trailing \0 */
+	char usednew;	/* number bytes used so far in output format buffer */
+
+	char *ptoappend; /* pointer to string to append to output buffer */
+	int ntoappend;	/* # of bytes to append to output buffer */
+
+	char buf[100];	/* scratch buffer */
+
+	assert(object && format && timetuple);
+	assert(PyString_Check(format));
+
+	/* Scan the input format, looking for %z and %Z escapes, building
+	 * a new format.
+	 */
+	totalnew = PyString_Size(format);	/* realistic if no %z/%Z */
+	newfmt = PyString_FromStringAndSize(NULL, totalnew);
+	if (newfmt == NULL) goto Done;
+	pnew = PyString_AsString(newfmt);
+	usednew = 0;
+
+	pin = PyString_AsString(format);
+	while ((ch = *pin++) != '\0') {
+		if (ch != '%') {
+			buf[0] = ch;
+			ptoappend = buf;
+			ntoappend = 1;
+		}
+		else if ((ch = *pin++) == '\0') {
+			/* There's a lone trailing %; doesn't make sense. */
+			PyErr_SetString(PyExc_ValueError, "strftime format "
+					"ends with raw %");
+			goto Done;
+		}
+		/* A % has been seen and ch is the character after it. */
+		else if (ch == 'z') {
+			if (zreplacement == NULL) {
+				/* format utcoffset */
+				PyObject *tzinfo = get_tzinfo_member(object);
+				zreplacement = PyString_FromString("");
+				if (zreplacement == NULL) goto Done;
+				if (tzinfo != Py_None && tzinfo != NULL) {
+					if (format_utcoffset(buf,
+							     (int)sizeof(buf),
+							     "",
+							     tzinfo,
+							     object) < 0)
+						goto Done;
+					Py_DECREF(zreplacement);
+					zreplacement = PyString_FromString(buf);
+					if (zreplacement == NULL) goto Done;
+				}
+			}
+			assert(zreplacement != NULL);
+			ptoappend = PyString_AsString(zreplacement);
+			ntoappend = PyString_Size(zreplacement);
+		}
+		else if (ch == 'Z') {
+			/* format tzname */
+			if (Zreplacement == NULL) {
+				PyObject *tzinfo = get_tzinfo_member(object);
+				Zreplacement = PyString_FromString("");
+				if (Zreplacement == NULL) goto Done;
+				if (tzinfo != Py_None && tzinfo != NULL) {
+					PyObject *temp = call_tzname(tzinfo,
+								     object);
+					if (temp == NULL) goto Done;
+					if (temp != Py_None) {
+						assert(PyString_Check(temp));
+						/* Since the tzname is getting
+						 * stuffed into the format, we
+						 * have to double any % signs
+						 * so that strftime doesn't
+						 * treat them as format codes.
+						 */
+						Py_DECREF(Zreplacement);
+						Zreplacement = PyObject_CallMethod(
+							temp, "replace",
+							"ss", "%", "%%");
+						Py_DECREF(temp);
+						if (Zreplacement == NULL)
+							goto Done;
+					}
+					else
+						Py_DECREF(temp);
+				}
+			}
+			assert(Zreplacement != NULL);
+			ptoappend = PyString_AsString(Zreplacement);
+			ntoappend = PyString_Size(Zreplacement);
+		}
+		else {
+			buf[0] = '%';
+			buf[1] = ch;
+			ptoappend = buf;
+			ntoappend = 2;
+		}
+
+ 		/* Append the ntoappend chars starting at ptoappend to
+ 		 * the new format.
+ 		 */
+ 		assert(ntoappend >= 0);
+ 		if (ntoappend == 0)
+ 			continue;
+ 		while (usednew + ntoappend > totalnew) {
+ 			int bigger = totalnew << 1;
+ 			if ((bigger >> 1) != totalnew) { /* overflow */
+ 				PyErr_NoMemory();
+ 				goto Done;
+ 			}
+ 			if (_PyString_Resize(&newfmt, bigger) < 0)
+ 				goto Done;
+ 			totalnew = bigger;
+ 			pnew = PyString_AsString(newfmt) + usednew;
+ 		}
+		memcpy(pnew, ptoappend, ntoappend);
+		pnew += ntoappend;
+		usednew += ntoappend;
+		assert(usednew <= totalnew);
+	}  /* end while() */
+
+	if (_PyString_Resize(&newfmt, usednew) < 0)
+		goto Done;
+	{
+		PyObject *time = PyImport_ImportModule("time");
+		if (time == NULL)
+			goto Done;
+		result = PyObject_CallMethod(time, "strftime", "OO",
+					     newfmt, timetuple);
+		Py_DECREF(time);
+    	}
+ Done:
+	Py_XDECREF(zreplacement);
+	Py_XDECREF(Zreplacement);
+	Py_XDECREF(newfmt);
+    	return result;
+}
+
+static char *
+isoformat_date(PyDateTime_Date *dt, char buffer[], int bufflen)
+{
+	int x;
+	x = PyOS_snprintf(buffer, bufflen,
+			  "%04d-%02d-%02d",
+			  GET_YEAR(dt), GET_MONTH(dt), GET_DAY(dt));
+	return buffer + x;
+}
+
+static void
+isoformat_time(PyDateTime_DateTime *dt, char buffer[], int bufflen)
+{
+	int us = DATE_GET_MICROSECOND(dt);
+
+	PyOS_snprintf(buffer, bufflen,
+		      "%02d:%02d:%02d",	/* 8 characters */
+		      DATE_GET_HOUR(dt),
+		      DATE_GET_MINUTE(dt),
+		      DATE_GET_SECOND(dt));
+	if (us)
+		PyOS_snprintf(buffer + 8, bufflen - 8, ".%06d", us);
+}
+
+/* ---------------------------------------------------------------------------
+ * Wrap functions from the time module.  These aren't directly available
+ * from C.  Perhaps they should be.
+ */
+
+/* Call time.time() and return its result (a Python float). */
+static PyObject *
+time_time()
+{
+	PyObject *result = NULL;
+	PyObject *time = PyImport_ImportModule("time");
+
+	if (time != NULL) {
+		result = PyObject_CallMethod(time, "time", "()");
+		Py_DECREF(time);
+	}
+	return result;
+}
+
+/* Build a time.struct_time.  The weekday and day number are automatically
+ * computed from the y,m,d args.
+ */
+static PyObject *
+build_struct_time(int y, int m, int d, int hh, int mm, int ss, int dstflag)
+{
+	PyObject *time;
+	PyObject *result = NULL;
+
+	time = PyImport_ImportModule("time");
+	if (time != NULL) {
+		result = PyObject_CallMethod(time, "struct_time",
+					     "((iiiiiiiii))",
+					     y, m, d,
+					     hh, mm, ss,
+				 	     weekday(y, m, d),
+				 	     days_before_month(y, m) + d,
+				 	     dstflag);
+		Py_DECREF(time);
+	}
+	return result;
+}
+
+/* ---------------------------------------------------------------------------
+ * Miscellaneous helpers.
+ */
+
+/* For obscure reasons, we need to use tp_richcompare instead of tp_compare.
+ * The comparisons here all most naturally compute a cmp()-like result.
+ * This little helper turns that into a bool result for rich comparisons.
+ */
+static PyObject *
+diff_to_bool(int diff, int op)
+{
+	PyObject *result;
+	int istrue;
+
+	switch (op) {
+		case Py_EQ: istrue = diff == 0; break;
+		case Py_NE: istrue = diff != 0; break;
+		case Py_LE: istrue = diff <= 0; break;
+		case Py_GE: istrue = diff >= 0; break;
+		case Py_LT: istrue = diff < 0; break;
+		case Py_GT: istrue = diff > 0; break;
+		default:
+			assert(! "op unknown");
+			istrue = 0; /* To shut up compiler */
+	}
+	result = istrue ? Py_True : Py_False;
+	Py_INCREF(result);
+	return result;
+}
+
+/* ---------------------------------------------------------------------------
+ * Helpers for setting object fields.  These work on pointers to the
+ * appropriate base class.
+ */
+
+/* For date, datetime and datetimetz. */
+static void
+set_date_fields(PyDateTime_Date *self, int y, int m, int d)
+{
+	self->hashcode = -1;
+	SET_YEAR(self, y);
+	SET_MONTH(self, m);
+	SET_DAY(self, d);
+}
+
+/* For datetime and datetimetz. */
+static void
+set_datetime_time_fields(PyDateTime_Date *self, int h, int m, int s, int us)
+{
+	DATE_SET_HOUR(self, h);
+	DATE_SET_MINUTE(self, m);
+	DATE_SET_SECOND(self, s);
+	DATE_SET_MICROSECOND(self, us);
+}
+
+/* For time and timetz. */
+static void
+set_time_fields(PyDateTime_Time *self, int h, int m, int s, int us)
+{
+	self->hashcode = -1;
+	TIME_SET_HOUR(self, h);
+	TIME_SET_MINUTE(self, m);
+	TIME_SET_SECOND(self, s);
+	TIME_SET_MICROSECOND(self, us);
+}
+
+/* ---------------------------------------------------------------------------
+ * Create various objects, mostly without range checking.
+ */
+
+/* Create a date instance with no range checking. */
+static PyObject *
+new_date(int year, int month, int day)
+{
+	PyDateTime_Date *self;
+
+	self = PyObject_New(PyDateTime_Date, &PyDateTime_DateType);
+	if (self != NULL)
+		set_date_fields(self, year, month, day);
+	return (PyObject *) self;
+}
+
+/* Create a datetime instance with no range checking. */
+static PyObject *
+new_datetime(int year, int month, int day, int hour, int minute,
+             int second, int usecond)
+{
+	PyDateTime_DateTime *self;
+
+	self = PyObject_New(PyDateTime_DateTime, &PyDateTime_DateTimeType);
+	if (self != NULL) {
+		set_date_fields((PyDateTime_Date *)self, year, month, day);
+		set_datetime_time_fields((PyDateTime_Date *)self,
+					 hour, minute, second, usecond);
+	}
+	return (PyObject *) self;
+}
+
+/* Create a datetimetz instance with no range checking. */
+static PyObject *
+new_datetimetz(int year, int month, int day, int hour, int minute,
+	       int second, int usecond, PyObject *tzinfo)
+{
+	PyDateTime_DateTimeTZ *self;
+
+	self = PyObject_New(PyDateTime_DateTimeTZ, &PyDateTime_DateTimeTZType);
+	if (self != NULL) {
+		set_date_fields((PyDateTime_Date *)self, year, month, day);
+		set_datetime_time_fields((PyDateTime_Date *)self,
+					 hour, minute, second, usecond);
+		Py_INCREF(tzinfo);
+		self->tzinfo = tzinfo;
+	}
+	return (PyObject *) self;
+}
+
+/* Create a time instance with no range checking. */
+static PyObject *
+new_time(int hour, int minute, int second, int usecond)
+{
+	PyDateTime_Time *self;
+
+	self = PyObject_New(PyDateTime_Time, &PyDateTime_TimeType);
+	if (self != NULL)
+		set_time_fields(self, hour, minute, second, usecond);
+	return (PyObject *) self;
+}
+
+/* Create a timetz instance with no range checking. */
+static PyObject *
+new_timetz(int hour, int minute, int second, int usecond, PyObject *tzinfo)
+{
+	PyDateTime_TimeTZ *self;
+
+	self = PyObject_New(PyDateTime_TimeTZ, &PyDateTime_TimeTZType);
+	if (self != NULL) {
+		set_time_fields((PyDateTime_Time *)self,
+				hour, minute, second, usecond);
+		Py_INCREF(tzinfo);
+		self->tzinfo = tzinfo;
+	}
+	return (PyObject *) self;
+}
+
+/* Create a timedelta instance.  Normalize the members iff normalize is
+ * true.  Passing false is a speed optimization, if you know for sure
+ * that seconds and microseconds are already in their proper ranges.  In any
+ * case, raises OverflowError and returns NULL if the normalized days is out
+ * of range).
+ */
+static PyObject *
+new_delta(int days, int seconds, int microseconds, int normalize)
+{
+	PyDateTime_Delta *self;
+
+	if (normalize)
+		normalize_d_s_us(&days, &seconds, &microseconds);
+	assert(0 <= seconds && seconds < 24*3600);
+	assert(0 <= microseconds && microseconds < 1000000);
+
+ 	if (check_delta_day_range(days) < 0)
+ 		return NULL;
+
+	self = PyObject_New(PyDateTime_Delta, &PyDateTime_DeltaType);
+	if (self != NULL) {
+		self->hashcode = -1;
+		SET_TD_DAYS(self, days);
+		SET_TD_SECONDS(self, seconds);
+		SET_TD_MICROSECONDS(self, microseconds);
+	}
+	return (PyObject *) self;
+}
+
+
+/* ---------------------------------------------------------------------------
+ * Cached Python objects; these are set by the module init function.
+ */
+
+/* Conversion factors. */
+static PyObject *us_per_us = NULL;	/* 1 */
+static PyObject *us_per_ms = NULL;	/* 1000 */
+static PyObject *us_per_second = NULL;	/* 1000000 */
+static PyObject *us_per_minute = NULL;	/* 1e6 * 60 as Python int */
+static PyObject *us_per_hour = NULL;	/* 1e6 * 3600 as Python long */
+static PyObject *us_per_day = NULL;	/* 1e6 * 3600 * 24 as Python long */
+static PyObject *us_per_week = NULL;	/* 1e6*3600*24*7 as Python long */
+static PyObject *seconds_per_day = NULL; /* 3600*24 as Python int */
+
+/* Callables to support unpickling. */
+static PyObject *date_unpickler_object = NULL;
+static PyObject *datetime_unpickler_object = NULL;
+static PyObject *datetimetz_unpickler_object = NULL;
+static PyObject *tzinfo_unpickler_object = NULL;
+static PyObject *time_unpickler_object = NULL;
+static PyObject *timetz_unpickler_object = NULL;
+
+/* ---------------------------------------------------------------------------
+ * Class implementations.
+ */
+
+/*
+ * PyDateTime_Delta implementation.
+ */
+
+/* Convert a timedelta to a number of us,
+ * 	(24*3600*self.days + self.seconds)*1000000 + self.microseconds
+ * as a Python int or long.
+ * Doing mixed-radix arithmetic by hand instead is excruciating in C,
+ * due to ubiquitous overflow possibilities.
+ */
+static PyObject *
+delta_to_microseconds(PyDateTime_Delta *self)
+{
+	PyObject *x1 = NULL;
+	PyObject *x2 = NULL;
+	PyObject *x3 = NULL;
+	PyObject *result = NULL;
+
+	x1 = PyInt_FromLong(GET_TD_DAYS(self));
+	if (x1 == NULL)
+		goto Done;
+	x2 = PyNumber_Multiply(x1, seconds_per_day);	/* days in seconds */
+	if (x2 == NULL)
+		goto Done;
+	Py_DECREF(x1);
+	x1 = NULL;
+
+	/* x2 has days in seconds */
+	x1 = PyInt_FromLong(GET_TD_SECONDS(self));	/* seconds */
+	if (x1 == NULL)
+		goto Done;
+	x3 = PyNumber_Add(x1, x2);	/* days and seconds in seconds */
+	if (x3 == NULL)
+		goto Done;
+	Py_DECREF(x1);
+	Py_DECREF(x2);
+	x1 = x2 = NULL;
+
+	/* x3 has days+seconds in seconds */
+	x1 = PyNumber_Multiply(x3, us_per_second);	/* us */
+	if (x1 == NULL)
+		goto Done;
+	Py_DECREF(x3);
+	x3 = NULL;
+
+	/* x1 has days+seconds in us */
+	x2 = PyInt_FromLong(GET_TD_MICROSECONDS(self));
+	if (x2 == NULL)
+		goto Done;
+	result = PyNumber_Add(x1, x2);
+
+Done:
+	Py_XDECREF(x1);
+	Py_XDECREF(x2);
+	Py_XDECREF(x3);
+	return result;
+}
+
+/* Convert a number of us (as a Python int or long) to a timedelta.
+ */
+static PyObject *
+microseconds_to_delta(PyObject *pyus)
+{
+	int us;
+	int s;
+	int d;
+
+	PyObject *tuple = NULL;
+	PyObject *num = NULL;
+	PyObject *result = NULL;
+
+	tuple = PyNumber_Divmod(pyus, us_per_second);
+	if (tuple == NULL)
+		goto Done;
+
+	num = PyTuple_GetItem(tuple, 1);	/* us */
+	if (num == NULL)
+		goto Done;
+	us = PyLong_AsLong(num);
+	num = NULL;
+	if (us < 0) {
+		/* The divisor was positive, so this must be an error. */
+		assert(PyErr_Occurred());
+		goto Done;
+	}
+
+	num = PyTuple_GetItem(tuple, 0);	/* leftover seconds */
+	if (num == NULL)
+		goto Done;
+	Py_INCREF(num);
+	Py_DECREF(tuple);
+
+	tuple = PyNumber_Divmod(num, seconds_per_day);
+	if (tuple == NULL)
+		goto Done;
+	Py_DECREF(num);
+
+	num = PyTuple_GetItem(tuple, 1); 	/* seconds */
+	if (num == NULL)
+		goto Done;
+	s = PyLong_AsLong(num);
+	num = NULL;
+	if (s < 0) {
+		/* The divisor was positive, so this must be an error. */
+		assert(PyErr_Occurred());
+		goto Done;
+	}
+
+	num = PyTuple_GetItem(tuple, 0);	/* leftover days */
+	if (num == NULL)
+		goto Done;
+	Py_INCREF(num);
+
+	d = PyLong_AsLong(num);
+	if (d == -1 && PyErr_Occurred())
+		goto Done;
+	result = new_delta(d, s, us, 0);
+
+Done:
+	Py_XDECREF(tuple);
+	Py_XDECREF(num);
+	return result;
+}
+
+static PyObject *
+multiply_int_timedelta(PyObject *intobj, PyDateTime_Delta *delta)
+{
+	PyObject *pyus_in;
+	PyObject *pyus_out;
+	PyObject *result;
+
+	pyus_in = delta_to_microseconds(delta);
+	if (pyus_in == NULL)
+		return NULL;
+
+	pyus_out = PyNumber_Multiply(pyus_in, intobj);
+	Py_DECREF(pyus_in);
+	if (pyus_out == NULL)
+		return NULL;
+
+	result = microseconds_to_delta(pyus_out);
+	Py_DECREF(pyus_out);
+	return result;
+}
+
+static PyObject *
+divide_timedelta_int(PyDateTime_Delta *delta, PyObject *intobj)
+{
+	PyObject *pyus_in;
+	PyObject *pyus_out;
+	PyObject *result;
+
+	pyus_in = delta_to_microseconds(delta);
+	if (pyus_in == NULL)
+		return NULL;
+
+	pyus_out = PyNumber_FloorDivide(pyus_in, intobj);
+	Py_DECREF(pyus_in);
+	if (pyus_out == NULL)
+		return NULL;
+
+	result = microseconds_to_delta(pyus_out);
+	Py_DECREF(pyus_out);
+	return result;
+}
+
+static PyObject *
+delta_add(PyObject *left, PyObject *right)
+{
+	PyObject *result = Py_NotImplemented;
+
+	if (PyDelta_Check(left) && PyDelta_Check(right)) {
+		/* delta + delta */
+		/* The C-level additions can't overflow because of the
+		 * invariant bounds.
+		 */
+		int days = GET_TD_DAYS(left) + GET_TD_DAYS(right);
+		int seconds = GET_TD_SECONDS(left) + GET_TD_SECONDS(right);
+		int microseconds = GET_TD_MICROSECONDS(left) +
+				   GET_TD_MICROSECONDS(right);
+		result = new_delta(days, seconds, microseconds, 1);
+	}
+
+	if (result == Py_NotImplemented)
+		Py_INCREF(result);
+	return result;
+}
+
+static PyObject *
+delta_negative(PyDateTime_Delta *self)
+{
+	return new_delta(-GET_TD_DAYS(self),
+			 -GET_TD_SECONDS(self),
+			 -GET_TD_MICROSECONDS(self),
+			 1);
+}
+
+static PyObject *
+delta_positive(PyDateTime_Delta *self)
+{
+	/* Could optimize this (by returning self) if this isn't a
+	 * subclass -- but who uses unary + ?  Approximately nobody.
+	 */
+	return new_delta(GET_TD_DAYS(self),
+			 GET_TD_SECONDS(self),
+			 GET_TD_MICROSECONDS(self),
+			 0);
+}
+
+static PyObject *
+delta_abs(PyDateTime_Delta *self)
+{
+	PyObject *result;
+
+	assert(GET_TD_MICROSECONDS(self) >= 0);
+	assert(GET_TD_SECONDS(self) >= 0);
+
+	if (GET_TD_DAYS(self) < 0)
+		result = delta_negative(self);
+	else
+		result = delta_positive(self);
+
+	return result;
+}
+
+static PyObject *
+delta_subtract(PyObject *left, PyObject *right)
+{
+	PyObject *result = Py_NotImplemented;
+
+	if (PyDelta_Check(left) && PyDelta_Check(right)) {
+	    	/* delta - delta */
+	    	PyObject *minus_right = PyNumber_Negative(right);
+	    	if (minus_right) {
+	    		result = delta_add(left, minus_right);
+	    		Py_DECREF(minus_right);
+	    	}
+	    	else
+	    		result = NULL;
+	}
+
+	if (result == Py_NotImplemented)
+		Py_INCREF(result);
+	return result;
+}
+
+/* This is more natural as a tp_compare, but doesn't work then:  for whatever
+ * reason, Python's try_3way_compare ignores tp_compare unless
+ * PyInstance_Check returns true, but these aren't old-style classes.
+ */
+static PyObject *
+delta_richcompare(PyDateTime_Delta *self, PyObject *other, int op)
+{
+	int diff;
+
+	if (! PyDelta_CheckExact(other)) {
+		PyErr_Format(PyExc_TypeError,
+			     "can't compare %s to %s instance",
+			     self->ob_type->tp_name, other->ob_type->tp_name);
+		return NULL;
+	}
+	diff = GET_TD_DAYS(self) - GET_TD_DAYS(other);
+	if (diff == 0) {
+		diff = GET_TD_SECONDS(self) - GET_TD_SECONDS(other);
+		if (diff == 0)
+			diff = GET_TD_MICROSECONDS(self) -
+			       GET_TD_MICROSECONDS(other);
+	}
+	return diff_to_bool(diff, op);
+}
+
+static PyObject *delta_getstate(PyDateTime_Delta *self);
+
+static long
+delta_hash(PyDateTime_Delta *self)
+{
+	if (self->hashcode == -1) {
+		PyObject *temp = delta_getstate(self);
+		if (temp != NULL) {
+			self->hashcode = PyObject_Hash(temp);
+			Py_DECREF(temp);
+		}
+	}
+	return self->hashcode;
+}
+
+static PyObject *
+delta_multiply(PyObject *left, PyObject *right)
+{
+	PyObject *result = Py_NotImplemented;
+
+	if (PyDelta_Check(left)) {
+		/* delta * ??? */
+		if (PyInt_Check(right) || PyLong_Check(right))
+			result = multiply_int_timedelta(right,
+					(PyDateTime_Delta *) left);
+	}
+	else if (PyInt_Check(left) || PyLong_Check(left))
+		result = multiply_int_timedelta(left,
+						(PyDateTime_Delta *) right);
+
+	if (result == Py_NotImplemented)
+		Py_INCREF(result);
+	return result;
+}
+
+static PyObject *
+delta_divide(PyObject *left, PyObject *right)
+{
+	PyObject *result = Py_NotImplemented;
+
+	if (PyDelta_Check(left)) {
+		/* delta * ??? */
+		if (PyInt_Check(right) || PyLong_Check(right))
+			result = divide_timedelta_int(
+					(PyDateTime_Delta *)left,
+					right);
+	}
+
+	if (result == Py_NotImplemented)
+		Py_INCREF(result);
+	return result;
+}
+
+/* Fold in the value of the tag ("seconds", "weeks", etc) component of a
+ * timedelta constructor.  sofar is the # of microseconds accounted for
+ * so far, and there are factor microseconds per current unit, the number
+ * of which is given by num.  num * factor is added to sofar in a
+ * numerically careful way, and that's the result.  Any fractional
+ * microseconds left over (this can happen if num is a float type) are
+ * added into *leftover.
+ * Note that there are many ways this can give an error (NULL) return.
+ */
+static PyObject *
+accum(const char* tag, PyObject *sofar, PyObject *num, PyObject *factor,
+      double *leftover)
+{
+	PyObject *prod;
+	PyObject *sum;
+
+	assert(num != NULL);
+
+	if (PyInt_Check(num) || PyLong_Check(num)) {
+		prod = PyNumber_Multiply(num, factor);
+		if (prod == NULL)
+			return NULL;
+		sum = PyNumber_Add(sofar, prod);
+		Py_DECREF(prod);
+		return sum;
+	}
+
+	if (PyFloat_Check(num)) {
+		double dnum;
+		double fracpart;
+		double intpart;
+		PyObject *x;
+		PyObject *y;
+
+		/* The Plan:  decompose num into an integer part and a
+		 * fractional part, num = intpart + fracpart.
+		 * Then num * factor ==
+		 *      intpart * factor + fracpart * factor
+		 * and the LHS can be computed exactly in long arithmetic.
+		 * The RHS is again broken into an int part and frac part.
+		 * and the frac part is added into *leftover.
+		 */
+		dnum = PyFloat_AsDouble(num);
+		if (dnum == -1.0 && PyErr_Occurred())
+			return NULL;
+		fracpart = modf(dnum, &intpart);
+		x = PyLong_FromDouble(intpart);
+		if (x == NULL)
+			return NULL;
+
+		prod = PyNumber_Multiply(x, factor);
+		Py_DECREF(x);
+		if (prod == NULL)
+			return NULL;
+
+		sum = PyNumber_Add(sofar, prod);
+		Py_DECREF(prod);
+		if (sum == NULL)
+			return NULL;
+
+		if (fracpart == 0.0)
+			return sum;
+		/* So far we've lost no information.  Dealing with the
+		 * fractional part requires float arithmetic, and may
+		 * lose a little info.
+		 */
+		assert(PyInt_Check(factor) || PyLong_Check(factor));
+		if (PyInt_Check(factor))
+			dnum = (double)PyInt_AsLong(factor);
+		else
+			dnum = PyLong_AsDouble(factor);
+
+		dnum *= fracpart;
+		fracpart = modf(dnum, &intpart);
+		x = PyLong_FromDouble(intpart);
+		if (x == NULL) {
+			Py_DECREF(sum);
+			return NULL;
+		}
+
+		y = PyNumber_Add(sum, x);
+		Py_DECREF(sum);
+		Py_DECREF(x);
+		*leftover += fracpart;
+		return y;
+	}
+
+	PyErr_Format(PyExc_TypeError,
+		     "unsupported type for timedelta %s component: %s",
+		     tag, num->ob_type->tp_name);
+	return NULL;
+}
+
+static PyObject *
+delta_new(PyTypeObject *type, PyObject *args, PyObject *kw)
+{
+	PyObject *self = NULL;
+
+	/* Argument objects. */
+	PyObject *day = NULL;
+	PyObject *second = NULL;
+	PyObject *us = NULL;
+	PyObject *ms = NULL;
+	PyObject *minute = NULL;
+	PyObject *hour = NULL;
+	PyObject *week = NULL;
+
+	PyObject *x = NULL;	/* running sum of microseconds */
+	PyObject *y = NULL;	/* temp sum of microseconds */
+	double leftover_us = 0.0;
+
+	static char *keywords[] = {
+		"days", "seconds", "microseconds", "milliseconds",
+		"minutes", "hours", "weeks", NULL
+	};
+
+	if (PyArg_ParseTupleAndKeywords(args, kw, "|OOOOOOO:__new__",
+					keywords,
+					&day, &second, &us,
+					&ms, &minute, &hour, &week) == 0)
+		goto Done;
+
+	x = PyInt_FromLong(0);
+	if (x == NULL)
+		goto Done;
+
+#define CLEANUP 	\
+	Py_DECREF(x);	\
+	x = y;		\
+	if (x == NULL)	\
+		goto Done
+
+	if (us) {
+		y = accum("microseconds", x, us, us_per_us, &leftover_us);
+		CLEANUP;
+	}
+	if (ms) {
+		y = accum("milliseconds", x, ms, us_per_ms, &leftover_us);
+		CLEANUP;
+	}
+	if (second) {
+		y = accum("seconds", x, second, us_per_second, &leftover_us);
+		CLEANUP;
+	}
+	if (minute) {
+		y = accum("minutes", x, minute, us_per_minute, &leftover_us);
+		CLEANUP;
+	}
+	if (hour) {
+		y = accum("hours", x, hour, us_per_hour, &leftover_us);
+		CLEANUP;
+	}
+	if (day) {
+		y = accum("days", x, day, us_per_day, &leftover_us);
+		CLEANUP;
+	}
+	if (week) {
+		y = accum("weeks", x, week, us_per_week, &leftover_us);
+		CLEANUP;
+	}
+	if (leftover_us) {
+		/* Round to nearest whole # of us, and add into x. */
+		PyObject *temp;
+		if (leftover_us >= 0.0)
+			leftover_us = floor(leftover_us + 0.5);
+		else
+			leftover_us = ceil(leftover_us - 0.5);
+		temp = PyLong_FromDouble(leftover_us);
+		if (temp == NULL) {
+			Py_DECREF(x);
+			goto Done;
+		}
+		y = PyNumber_Add(x, temp);
+		Py_DECREF(temp);
+		CLEANUP;
+	}
+
+	self = microseconds_to_delta(x);
+	Py_DECREF(x);
+Done:
+	return self;
+
+#undef CLEANUP
+}
+
+static int
+delta_nonzero(PyDateTime_Delta *self)
+{
+	return (GET_TD_DAYS(self) != 0
+		|| GET_TD_SECONDS(self) != 0
+		|| GET_TD_MICROSECONDS(self) != 0);
+}
+
+static PyObject *
+delta_repr(PyDateTime_Delta *self)
+{
+	if (GET_TD_MICROSECONDS(self) != 0)
+		return PyString_FromFormat("%s(%d, %d, %d)",
+					   self->ob_type->tp_name,
+					   GET_TD_DAYS(self),
+					   GET_TD_SECONDS(self),
+					   GET_TD_MICROSECONDS(self));
+	if (GET_TD_SECONDS(self) != 0)
+		return PyString_FromFormat("%s(%d, %d)",
+					   self->ob_type->tp_name,
+					   GET_TD_DAYS(self),
+					   GET_TD_SECONDS(self));
+
+	return PyString_FromFormat("%s(%d)",
+				   self->ob_type->tp_name,
+				   GET_TD_DAYS(self));
+}
+
+static PyObject *
+delta_str(PyDateTime_Delta *self)
+{
+	int days = GET_TD_DAYS(self);
+	int seconds = GET_TD_SECONDS(self);
+	int us = GET_TD_MICROSECONDS(self);
+	int hours;
+	int minutes;
+	char buf[500];
+	int i = 0;
+
+	minutes = divmod(seconds, 60, &seconds);
+	hours = divmod(minutes, 60, &minutes);
+
+	if (days) {
+		i += sprintf(buf + i, "%d day%s, ", days,
+			     (days == 1 || days == -1) ? "" : "s");
+		assert(i < sizeof(buf));
+	}
+
+	i += sprintf(buf + i, "%d:%02d:%02d", hours, minutes, seconds);
+	assert(i < sizeof(buf));
+
+	if (us) {
+		i += sprintf(buf + i, ".%06d", us);
+		assert(i < sizeof(buf));
+	}
+
+	return PyString_FromStringAndSize(buf, i);
+}
+
+/* Pickle support.  Quite a maze!  While __getstate__/__setstate__ sufficed
+ * in the Python implementation, the C implementation also requires
+ * __reduce__, and a __safe_for_unpickling__ attr in the type object.
+ */
+static PyObject *
+delta_getstate(PyDateTime_Delta *self)
+{
+	return Py_BuildValue("iii", GET_TD_DAYS(self),
+				    GET_TD_SECONDS(self),
+				    GET_TD_MICROSECONDS(self));
+}
+
+static PyObject *
+delta_setstate(PyDateTime_Delta *self, PyObject *state)
+{
+	int day;
+	int second;
+	int us;
+
+	if (!PyArg_ParseTuple(state, "iii:__setstate__", &day, &second, &us))
+		return NULL;
+
+	self->hashcode = -1;
+	SET_TD_DAYS(self, day);
+	SET_TD_SECONDS(self, second);
+	SET_TD_MICROSECONDS(self, us);
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+static PyObject *
+delta_reduce(PyDateTime_Delta* self)
+{
+	PyObject* result = NULL;
+	PyObject* state  = delta_getstate(self);
+
+	if (state != NULL) {
+		/* The funky "()" in the format string creates an empty
+		 * tuple as the 2nd component of the result 3-tuple.
+		 */
+		result = Py_BuildValue("O()O", self->ob_type, state);
+		Py_DECREF(state);
+	}
+	return result;
+}
+
+#define OFFSET(field)  offsetof(PyDateTime_Delta, field)
+
+static PyMemberDef delta_members[] = {
+	{"days",         T_LONG, OFFSET(days),         READONLY,
+	 PyDoc_STR("Number of days.")},
+
+	{"seconds",      T_LONG, OFFSET(seconds),      READONLY,
+	 PyDoc_STR("Number of seconds (>= 0 and less than 1 day).")},
+
+	{"microseconds", T_LONG, OFFSET(microseconds), READONLY,
+	 PyDoc_STR("Number of microseconds (>= 0 and less than 1 second).")},
+	{NULL}
+};
+
+static PyMethodDef delta_methods[] = {
+	{"__setstate__", (PyCFunction)delta_setstate, METH_O,
+	 PyDoc_STR("__setstate__(state)")},
+
+	{"__reduce__", (PyCFunction)delta_reduce,     METH_NOARGS,
+	 PyDoc_STR("__setstate__(state)")},
+
+	{"__getstate__", (PyCFunction)delta_getstate, METH_NOARGS,
+	 PyDoc_STR("__getstate__() -> state")},
+	{NULL,	NULL},
+};
+
+static char delta_doc[] =
+PyDoc_STR("Difference between two datetime values.");
+
+static PyNumberMethods delta_as_number = {
+	delta_add,				/* nb_add */
+	delta_subtract,				/* nb_subtract */
+	delta_multiply,				/* nb_multiply */
+	delta_divide,				/* nb_divide */
+	0,					/* nb_remainder */
+	0,					/* nb_divmod */
+	0,					/* nb_power */
+	(unaryfunc)delta_negative,		/* nb_negative */
+	(unaryfunc)delta_positive,		/* nb_positive */
+	(unaryfunc)delta_abs,			/* nb_absolute */
+	(inquiry)delta_nonzero,			/* nb_nonzero */
+	0,					/*nb_invert*/
+	0,					/*nb_lshift*/
+	0,					/*nb_rshift*/
+	0,					/*nb_and*/
+	0,					/*nb_xor*/
+	0,					/*nb_or*/
+	0,					/*nb_coerce*/
+	0,					/*nb_int*/
+	0,					/*nb_long*/
+	0,					/*nb_float*/
+	0,					/*nb_oct*/
+	0, 					/*nb_hex*/
+	0,					/*nb_inplace_add*/
+	0,					/*nb_inplace_subtract*/
+	0,					/*nb_inplace_multiply*/
+	0,					/*nb_inplace_divide*/
+	0,					/*nb_inplace_remainder*/
+	0,					/*nb_inplace_power*/
+	0,					/*nb_inplace_lshift*/
+	0,					/*nb_inplace_rshift*/
+	0,					/*nb_inplace_and*/
+	0,					/*nb_inplace_xor*/
+	0,					/*nb_inplace_or*/
+	delta_divide,				/* nb_floor_divide */
+	0,					/* nb_true_divide */
+	0,					/* nb_inplace_floor_divide */
+	0,					/* nb_inplace_true_divide */
+};
+
+static PyTypeObject PyDateTime_DeltaType = {
+	PyObject_HEAD_INIT(NULL)
+	0,						/* ob_size */
+	"datetime.timedelta",				/* tp_name */
+	sizeof(PyDateTime_Delta),			/* tp_basicsize */
+	0,						/* tp_itemsize */
+	0,						/* tp_dealloc */
+	0,						/* tp_print */
+	0,						/* tp_getattr */
+	0,						/* tp_setattr */
+	0,						/* tp_compare */
+	(reprfunc)delta_repr,				/* tp_repr */
+	&delta_as_number,				/* tp_as_number */
+	0,						/* tp_as_sequence */
+	0,						/* tp_as_mapping */
+	(hashfunc)delta_hash,				/* tp_hash */
+	0,              				/* tp_call */
+	(reprfunc)delta_str,				/* tp_str */
+	PyObject_GenericGetAttr,			/* tp_getattro */
+	0,						/* tp_setattro */
+	0,						/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES,	/* tp_flags */
+	delta_doc,					/* tp_doc */
+	0,						/* tp_traverse */
+	0,						/* tp_clear */
+	(richcmpfunc)delta_richcompare,			/* tp_richcompare */
+	0,						/* tp_weaklistoffset */
+	0,						/* tp_iter */
+	0,						/* tp_iternext */
+	delta_methods,					/* tp_methods */
+	delta_members,					/* tp_members */
+	0,						/* tp_getset */
+	0,						/* tp_base */
+	0,						/* tp_dict */
+	0,						/* tp_descr_get */
+	0,						/* tp_descr_set */
+	0,						/* tp_dictoffset */
+	0,						/* tp_init */
+	0,						/* tp_alloc */
+	delta_new,					/* tp_new */
+	_PyObject_Del,					/* tp_free */
+};
+
+/*
+ * PyDateTime_Date implementation.
+ */
+
+/* Accessor properties. */
+
+static PyObject *
+date_year(PyDateTime_Date *self, void *unused)
+{
+	return PyInt_FromLong(GET_YEAR(self));
+}
+
+static PyObject *
+date_month(PyDateTime_Date *self, void *unused)
+{
+	return PyInt_FromLong(GET_MONTH(self));
+}
+
+static PyObject *
+date_day(PyDateTime_Date *self, void *unused)
+{
+	return PyInt_FromLong(GET_DAY(self));
+}
+
+static PyGetSetDef date_getset[] = {
+	{"year",        (getter)date_year},
+	{"month",       (getter)date_month},
+	{"day",         (getter)date_day},
+	{NULL}
+};
+
+/* Constructors. */
+
+static PyObject *
+date_new(PyTypeObject *type, PyObject *args, PyObject *kw)
+{
+	PyObject *self = NULL;
+	int year;
+	int month;
+	int day;
+
+	static char *keywords[] = {
+		"year", "month", "day", NULL
+	};
+
+	if (PyArg_ParseTupleAndKeywords(args, kw, "iii", keywords,
+					&year, &month, &day)) {
+		if (check_date_args(year, month, day) < 0)
+			return NULL;
+		self = new_date(year, month, day);
+	}
+	return self;
+}
+
+/* Return new date from localtime(t). */
+static PyObject *
+date_local_from_time_t(PyObject *cls, time_t t)
+{
+	struct tm *tm;
+	PyObject *result = NULL;
+
+	tm = localtime(&t);
+	if (tm)
+		result = PyObject_CallFunction(cls, "iii",
+					       tm->tm_year + 1900,
+					       tm->tm_mon + 1,
+					       tm->tm_mday);
+	else
+		PyErr_SetString(PyExc_ValueError,
+				"timestamp out of range for "
+				"platform localtime() function");
+	return result;
+}
+
+/* Return new date from current time.
+ * We say this is equivalent to fromtimestamp(time.time()), and the
+ * only way to be sure of that is to *call* time.time().  That's not
+ * generally the same as calling C's time.
+ */
+static PyObject *
+date_today(PyObject *cls, PyObject *dummy)
+{
+	PyObject *time;
+	PyObject *result;
+
+	time = time_time();
+	if (time == NULL)
+		return NULL;
+
+	/* Note well:  today() is a class method, so this may not call
+	 * date.fromtimestamp.  For example, it may call
+	 * datetime.fromtimestamp.  That's why we need all the accuracy
+	 * time.time() delivers; if someone were gonzo about optimization,
+	 * date.today() could get away with plain C time().
+	 */
+	result = PyObject_CallMethod(cls, "fromtimestamp", "O", time);
+	Py_DECREF(time);
+	return result;
+}
+
+/* Return new date from given timestamp (Python timestamp -- a double). */
+static PyObject *
+date_fromtimestamp(PyObject *cls, PyObject *args)
+{
+	double timestamp;
+	PyObject *result = NULL;
+
+	if (PyArg_ParseTuple(args, "d:fromtimestamp", &timestamp))
+		result = date_local_from_time_t(cls, (time_t)timestamp);
+	return result;
+}
+
+/* Return new date from proleptic Gregorian ordinal.  Raises ValueError if
+ * the ordinal is out of range.
+ */
+static PyObject *
+date_fromordinal(PyObject *cls, PyObject *args)
+{
+	PyObject *result = NULL;
+	int ordinal;
+
+	if (PyArg_ParseTuple(args, "i:fromordinal", &ordinal)) {
+		int year;
+		int month;
+		int day;
+
+		if (ordinal < 1)
+			PyErr_SetString(PyExc_ValueError, "ordinal must be "
+							  ">= 1");
+		else {
+			ord_to_ymd(ordinal, &year, &month, &day);
+			result = PyObject_CallFunction(cls, "iii",
+						       year, month, day);
+		}
+	}
+	return result;
+}
+
+/*
+ * Date arithmetic.
+ */
+
+/* date + timedelta -> date.  If arg negate is true, subtract the timedelta
+ * instead.
+ */
+static PyObject *
+add_date_timedelta(PyDateTime_Date *date, PyDateTime_Delta *delta, int negate)
+{
+	PyObject *result = NULL;
+	int year = GET_YEAR(date);
+	int month = GET_MONTH(date);
+	int deltadays = GET_TD_DAYS(delta);
+	/* C-level overflow is impossible because |deltadays| < 1e9. */
+	int day = GET_DAY(date) + (negate ? -deltadays : deltadays);
+
+	if (normalize_date(&year, &month, &day) >= 0)
+		result = new_date(year, month, day);
+	return result;
+}
+
+static PyObject *
+date_add(PyObject *left, PyObject *right)
+{
+	if (PyDateTime_Check(left) || PyDateTime_Check(right)) {
+		Py_INCREF(Py_NotImplemented);
+		return Py_NotImplemented;
+	}
+	if (PyDate_CheckExact(left)) {
+		/* date + ??? */
+		if (PyDelta_Check(right))
+			/* date + delta */
+			return add_date_timedelta((PyDateTime_Date *) left,
+						  (PyDateTime_Delta *) right,
+						  0);
+	}
+	else {
+		/* ??? + date
+		 * 'right' must be one of us, or we wouldn't have been called
+		 */
+		if (PyDelta_Check(left))
+			/* delta + date */
+			return add_date_timedelta((PyDateTime_Date *) right,
+						  (PyDateTime_Delta *) left,
+						  0);
+	}
+	Py_INCREF(Py_NotImplemented);
+	return Py_NotImplemented;
+}
+
+static PyObject *
+date_subtract(PyObject *left, PyObject *right)
+{
+	if (PyDateTime_Check(left) || PyDateTime_Check(right)) {
+		Py_INCREF(Py_NotImplemented);
+		return Py_NotImplemented;
+	}
+	if (PyDate_CheckExact(left)) {
+		if (PyDate_CheckExact(right)) {
+			/* date - date */
+			int left_ord = ymd_to_ord(GET_YEAR(left),
+						  GET_MONTH(left),
+						  GET_DAY(left));
+			int right_ord = ymd_to_ord(GET_YEAR(right),
+						   GET_MONTH(right),
+						   GET_DAY(right));
+			return new_delta(left_ord - right_ord, 0, 0, 0);
+		}
+		if (PyDelta_Check(right)) {
+			/* date - delta */
+			return add_date_timedelta((PyDateTime_Date *) left,
+						  (PyDateTime_Delta *) right,
+						  1);
+		}
+	}
+	Py_INCREF(Py_NotImplemented);
+	return Py_NotImplemented;
+}
+
+
+/* Various ways to turn a date into a string. */
+
+static PyObject *
+date_repr(PyDateTime_Date *self)
+{
+	char buffer[1028];
+	char *typename;
+
+	typename = self->ob_type->tp_name;
+	PyOS_snprintf(buffer, sizeof(buffer), "%s(%d, %d, %d)",
+		      typename,
+		      GET_YEAR(self), GET_MONTH(self), GET_DAY(self));
+
+	return PyString_FromString(buffer);
+}
+
+static PyObject *
+date_isoformat(PyDateTime_Date *self)
+{
+	char buffer[128];
+
+	isoformat_date(self, buffer, sizeof(buffer));
+	return PyString_FromString(buffer);
+}
+
+/* str() calls the appropriate isofomat() method. */
+static PyObject *
+date_str(PyDateTime_Date *self)
+{
+	return PyObject_CallMethod((PyObject *)self, "isoformat", "()");
+}
+
+
+static PyObject *
+date_ctime(PyDateTime_Date *self)
+{
+	return format_ctime(self, 0, 0, 0);
+}
+
+static PyObject *
+date_strftime(PyDateTime_Date *self, PyObject *args, PyObject *kw)
+{
+	/* This method can be inherited, and needs to call the
+	 * timetuple() method appropriate to self's class.
+	 */
+	PyObject *result;
+	PyObject *format;
+	PyObject *tuple;
+	static char *keywords[] = {"format", NULL};
+
+	if (! PyArg_ParseTupleAndKeywords(args, kw, "O!:strftime", keywords,
+					  &PyString_Type, &format))
+		return NULL;
+
+	tuple = PyObject_CallMethod((PyObject *)self, "timetuple", "()");
+	if (tuple == NULL)
+		return NULL;
+	result = wrap_strftime((PyObject *)self, format, tuple);
+	Py_DECREF(tuple);
+	return result;
+}
+
+/* ISO methods. */
+
+static PyObject *
+date_isoweekday(PyDateTime_Date *self)
+{
+	int dow = weekday(GET_YEAR(self), GET_MONTH(self), GET_DAY(self));
+
+	return PyInt_FromLong(dow + 1);
+}
+
+static PyObject *
+date_isocalendar(PyDateTime_Date *self)
+{
+	int  year         = GET_YEAR(self);
+	int  week1_monday = iso_week1_monday(year);
+	int today         = ymd_to_ord(year, GET_MONTH(self), GET_DAY(self));
+	int  week;
+	int  day;
+
+	week = divmod(today - week1_monday, 7, &day);
+	if (week < 0) {
+		--year;
+		week1_monday = iso_week1_monday(year);
+		week = divmod(today - week1_monday, 7, &day);
+	}
+	else if (week >= 52 && today >= iso_week1_monday(year + 1)) {
+		++year;
+		week = 0;
+	}
+	return Py_BuildValue("iii", year, week + 1, day + 1);
+}
+
+/* Miscellaneous methods. */
+
+/* This is more natural as a tp_compare, but doesn't work then:  for whatever
+ * reason, Python's try_3way_compare ignores tp_compare unless
+ * PyInstance_Check returns true, but these aren't old-style classes.
+ */
+static PyObject *
+date_richcompare(PyDateTime_Date *self, PyObject *other, int op)
+{
+	int diff;
+
+	if (! PyDate_Check(other)) {
+		PyErr_Format(PyExc_TypeError,
+			     "can't compare date to %s instance",
+			     other->ob_type->tp_name);
+		return NULL;
+	}
+	diff = memcmp(self->data, ((PyDateTime_Date *)other)->data,
+		      _PyDateTime_DATE_DATASIZE);
+	return diff_to_bool(diff, op);
+}
+
+static PyObject *
+date_timetuple(PyDateTime_Date *self)
+{
+	return build_struct_time(GET_YEAR(self),
+				 GET_MONTH(self),
+				 GET_DAY(self),
+				 0, 0, 0, -1);
+}
+
+static PyObject *date_getstate(PyDateTime_Date *self);
+
+static long
+date_hash(PyDateTime_Date *self)
+{
+	if (self->hashcode == -1) {
+		PyObject *temp = date_getstate(self);
+		if (temp != NULL) {
+			self->hashcode = PyObject_Hash(temp);
+			Py_DECREF(temp);
+		}
+	}
+	return self->hashcode;
+}
+
+static PyObject *
+date_toordinal(PyDateTime_Date *self)
+{
+	return PyInt_FromLong(ymd_to_ord(GET_YEAR(self), GET_MONTH(self),
+					 GET_DAY(self)));
+}
+
+static PyObject *
+date_weekday(PyDateTime_Date *self)
+{
+	int dow = weekday(GET_YEAR(self), GET_MONTH(self), GET_DAY(self));
+
+	return PyInt_FromLong(dow);
+}
+
+/* Pickle support.  Quite a maze! */
+
+static PyObject *
+date_getstate(PyDateTime_Date *self)
+{
+	return PyString_FromStringAndSize(self->data,
+					  _PyDateTime_DATE_DATASIZE);
+}
+
+static PyObject *
+date_setstate(PyDateTime_Date *self, PyObject *state)
+{
+	const int len = PyString_Size(state);
+	unsigned char *pdata = (unsigned char*)PyString_AsString(state);
+
+	if (! PyString_Check(state) ||
+	    len != _PyDateTime_DATE_DATASIZE) {
+		PyErr_SetString(PyExc_TypeError,
+				"bad argument to date.__setstate__");
+		return NULL;
+	}
+	memcpy(self->data, pdata, _PyDateTime_DATE_DATASIZE);
+	self->hashcode = -1;
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+/* XXX This seems a ridiculously inefficient way to pickle a short string. */
+static PyObject *
+date_pickler(PyObject *module, PyDateTime_Date *date)
+{
+	PyObject *state;
+	PyObject *result = NULL;
+
+	if (! PyDate_CheckExact(date)) {
+		PyErr_Format(PyExc_TypeError,
+			     "bad type passed to date pickler: %s",
+			     date->ob_type->tp_name);
+		return NULL;
+	}
+	state = date_getstate(date);
+	if (state) {
+		result = Py_BuildValue("O(O)", date_unpickler_object, state);
+		Py_DECREF(state);
+	}
+	return result;
+}
+
+static PyObject *
+date_unpickler(PyObject *module, PyObject *arg)
+{
+	PyDateTime_Date *self;
+
+	if (! PyString_CheckExact(arg)) {
+		PyErr_Format(PyExc_TypeError,
+			     "bad type passed to date unpickler: %s",
+			     arg->ob_type->tp_name);
+		return NULL;
+	}
+	self = PyObject_New(PyDateTime_Date, &PyDateTime_DateType);
+	if (self != NULL) {
+		PyObject *res = date_setstate(self, arg);
+		if (res == NULL) {
+			Py_DECREF(self);
+			return NULL;
+		}
+		Py_DECREF(res);
+	}
+	return (PyObject *)self;
+}
+
+static PyMethodDef date_methods[] = {
+	/* Class methods: */
+	{"fromtimestamp", (PyCFunction)date_fromtimestamp, METH_VARARGS |
+							   METH_CLASS,
+	 PyDoc_STR("timestamp -> local date from a POSIX timestamp (like "
+	 	   "time.time()).")},
+
+	{"fromordinal", (PyCFunction)date_fromordinal,	METH_VARARGS |
+							METH_CLASS,
+	 PyDoc_STR("int -> date corresponding to a proleptic Gregorian "
+	 	   "ordinal.")},
+
+	{"today",         (PyCFunction)date_today,   METH_NOARGS | METH_CLASS,
+	 PyDoc_STR("Current date or datetime:  same as "
+	 	   "self.__class__.fromtimestamp(time.time()).")},
+
+	/* Instance methods: */
+
+	{"ctime",       (PyCFunction)date_ctime,        METH_NOARGS,
+	 PyDoc_STR("Return ctime() style string.")},
+
+	{"strftime",   	(PyCFunction)date_strftime,	METH_KEYWORDS,
+	 PyDoc_STR("format -> strftime() style string.")},
+
+	{"timetuple",   (PyCFunction)date_timetuple,    METH_NOARGS,
+         PyDoc_STR("Return time tuple, compatible with time.localtime().")},
+
+	{"isocalendar", (PyCFunction)date_isocalendar,  METH_NOARGS,
+	 PyDoc_STR("Return a 3-tuple containing ISO year, week number, and "
+	 	   "weekday.")},
+
+	{"isoformat",   (PyCFunction)date_isoformat,	METH_NOARGS,
+	 PyDoc_STR("Return string in ISO 8601 format, YYYY-MM-DD.")},
+
+	{"isoweekday",  (PyCFunction)date_isoweekday,   METH_NOARGS,
+	 PyDoc_STR("Return the day of the week represented by the date.\n"
+	 	   "Monday == 1 ... Sunday == 7")},
+
+	{"toordinal",   (PyCFunction)date_toordinal,    METH_NOARGS,
+	 PyDoc_STR("Return proleptic Gregorian ordinal.  January 1 of year "
+	 	   "1 is day 1.")},
+
+	{"weekday",     (PyCFunction)date_weekday,      METH_NOARGS,
+	 PyDoc_STR("Return the day of the week represented by the date.\n"
+		   "Monday == 0 ... Sunday == 6")},
+
+	{"__setstate__", (PyCFunction)date_setstate,	METH_O,
+	 PyDoc_STR("__setstate__(state)")},
+
+	{"__getstate__", (PyCFunction)date_getstate,	METH_NOARGS,
+	 PyDoc_STR("__getstate__() -> state")},
+
+	{NULL,	NULL}
+};
+
+static char date_doc[] =
+PyDoc_STR("Basic date type.");
+
+static PyNumberMethods date_as_number = {
+	date_add,					/* nb_add */
+	date_subtract,					/* nb_subtract */
+	0,						/* nb_multiply */
+	0,						/* nb_divide */
+	0,						/* nb_remainder */
+	0,						/* nb_divmod */
+	0,						/* nb_power */
+	0,						/* nb_negative */
+	0,						/* nb_positive */
+	0,						/* nb_absolute */
+	0,						/* nb_nonzero */
+};
+
+static PyTypeObject PyDateTime_DateType = {
+	PyObject_HEAD_INIT(NULL)
+	0,						/* ob_size */
+	"datetime.date",				/* tp_name */
+	sizeof(PyDateTime_Date),			/* tp_basicsize */
+	0,						/* tp_itemsize */
+	(destructor)PyObject_Del,			/* tp_dealloc */
+	0,						/* tp_print */
+	0,						/* tp_getattr */
+	0,						/* tp_setattr */
+	0,						/* tp_compare */
+	(reprfunc)date_repr,				/* tp_repr */
+	&date_as_number,				/* tp_as_number */
+	0,						/* tp_as_sequence */
+	0,						/* tp_as_mapping */
+	(hashfunc)date_hash,				/* tp_hash */
+	0,              				/* tp_call */
+	(reprfunc)date_str,				/* tp_str */
+	PyObject_GenericGetAttr,			/* tp_getattro */
+	0,						/* tp_setattro */
+	0,						/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES |
+        Py_TPFLAGS_BASETYPE,				/* tp_flags */
+	date_doc,					/* tp_doc */
+	0,						/* tp_traverse */
+	0,						/* tp_clear */
+	(richcmpfunc)date_richcompare,			/* tp_richcompare */
+	0,						/* tp_weaklistoffset */
+	0,						/* tp_iter */
+	0,						/* tp_iternext */
+	date_methods,					/* tp_methods */
+	0,						/* tp_members */
+	date_getset,					/* tp_getset */
+	0,						/* tp_base */
+	0,						/* tp_dict */
+	0,						/* tp_descr_get */
+	0,						/* tp_descr_set */
+	0,						/* tp_dictoffset */
+	0,						/* tp_init */
+	0,						/* tp_alloc */
+	date_new,					/* tp_new */
+	_PyObject_Del,					/* tp_free */
+};
+
+/*
+ * PyDateTime_DateTime implementation.
+ */
+
+/* Accessor properties. */
+
+static PyObject *
+datetime_hour(PyDateTime_DateTime *self, void *unused)
+{
+	return PyInt_FromLong(DATE_GET_HOUR(self));
+}
+
+static PyObject *
+datetime_minute(PyDateTime_DateTime *self, void *unused)
+{
+	return PyInt_FromLong(DATE_GET_MINUTE(self));
+}
+
+static PyObject *
+datetime_second(PyDateTime_DateTime *self, void *unused)
+{
+	return PyInt_FromLong(DATE_GET_SECOND(self));
+}
+
+static PyObject *
+datetime_microsecond(PyDateTime_DateTime *self, void *unused)
+{
+	return PyInt_FromLong(DATE_GET_MICROSECOND(self));
+}
+
+static PyGetSetDef datetime_getset[] = {
+	{"hour",        (getter)datetime_hour},
+	{"minute",      (getter)datetime_minute},
+	{"second",      (getter)datetime_second},
+	{"microsecond", (getter)datetime_microsecond},
+	{NULL}
+};
+
+/* Constructors. */
+
+static PyObject *
+datetime_new(PyTypeObject *type, PyObject *args, PyObject *kw)
+{
+	PyObject *self = NULL;
+	int year;
+	int month;
+	int day;
+	int hour = 0;
+	int minute = 0;
+	int second = 0;
+	int usecond = 0;
+
+	static char *keywords[] = {
+		"year", "month", "day", "hour", "minute", "second",
+		"microsecond", NULL
+	};
+
+	if (PyArg_ParseTupleAndKeywords(args, kw, "iii|iiii", keywords,
+					&year, &month, &day, &hour, &minute,
+					&second, &usecond)) {
+		if (check_date_args(year, month, day) < 0)
+			return NULL;
+		if (check_time_args(hour, minute, second, usecond) < 0)
+			return NULL;
+		self = new_datetime(year, month, day,
+				    hour, minute, second, usecond);
+	}
+	return self;
+}
+
+
+/* TM_FUNC is the shared type of localtime() and gmtime(). */
+typedef struct tm *(*TM_FUNC)(const time_t *timer);
+
+/* Internal helper.
+ * Build datetime from a time_t and a distinct count of microseconds.
+ * Pass localtime or gmtime for f, to control the interpretation of timet.
+ */
+static PyObject *
+datetime_from_timet_and_us(PyObject *cls, TM_FUNC f, time_t timet, int us)
+{
+	struct tm *tm;
+	PyObject *result = NULL;
+
+	tm = f(&timet);
+	if (tm)
+		result = PyObject_CallFunction(cls, "iiiiiii",
+					       tm->tm_year + 1900,
+					       tm->tm_mon + 1,
+					       tm->tm_mday,
+					       tm->tm_hour,
+					       tm->tm_min,
+					       tm->tm_sec,
+					       us);
+	else
+		PyErr_SetString(PyExc_ValueError,
+				"timestamp out of range for "
+				"platform localtime()/gmtime() function");
+	return result;
+}
+
+/* Internal helper.
+ * Build datetime from a Python timestamp.  Pass localtime or gmtime for f,
+ * to control the interpretation of the timestamp.  Since a double doesn't
+ * have enough bits to cover a datetime's full range of precision, it's
+ * better to call datetime_from_timet_and_us provided you have a way
+ * to get that much precision (e.g., C time() isn't good enough).
+ */
+static PyObject *
+datetime_from_timestamp(PyObject *cls, TM_FUNC f, double timestamp)
+{
+	time_t timet = (time_t)timestamp;
+	int us = (int)((timestamp - (double)timet) * 1e6);
+
+	return datetime_from_timet_and_us(cls, f, timet, us);
+}
+
+/* Internal helper.
+ * Build most accurate possible datetime for current time.  Pass localtime or
+ * gmtime for f as appropriate.
+ */
+static PyObject *
+datetime_best_possible(PyObject *cls, TM_FUNC f)
+{
+#ifdef HAVE_GETTIMEOFDAY
+	struct timeval t;
+
+#ifdef GETTIMEOFDAY_NO_TZ
+	gettimeofday(&t);
+#else
+	gettimeofday(&t, (struct timezone *)NULL);
+#endif
+	return datetime_from_timet_and_us(cls, f, t.tv_sec, (int)t.tv_usec);
+
+#else	/* ! HAVE_GETTIMEOFDAY */
+	/* No flavor of gettimeofday exists on this platform.  Python's
+	 * time.time() does a lot of other platform tricks to get the
+	 * best time it can on the platform, and we're not going to do
+	 * better than that (if we could, the better code would belong
+	 * in time.time()!)  We're limited by the precision of a double,
+	 * though.
+	 */
+	PyObject *time;
+	double dtime;
+
+	time = time_time();
+    	if (time == NULL)
+    		return NULL;
+	dtime = PyFloat_AsDouble(time);
+	Py_DECREF(time);
+	if (dtime == -1.0 && PyErr_Occurred())
+		return NULL;
+	return datetime_from_timestamp(cls, f, dtime);
+#endif	/* ! HAVE_GETTIMEOFDAY */
+}
+
+/* Return new local datetime from timestamp (Python timestamp -- a double). */
+static PyObject *
+datetime_fromtimestamp(PyObject *cls, PyObject *args)
+{
+	double timestamp;
+	PyObject *result = NULL;
+
+	if (PyArg_ParseTuple(args, "d:fromtimestamp", &timestamp))
+		result = datetime_from_timestamp(cls, localtime, timestamp);
+	return result;
+}
+
+/* Return new UTC datetime from timestamp (Python timestamp -- a double). */
+static PyObject *
+datetime_utcfromtimestamp(PyObject *cls, PyObject *args)
+{
+	double timestamp;
+	PyObject *result = NULL;
+
+	if (PyArg_ParseTuple(args, "d:utcfromtimestamp", &timestamp))
+		result = datetime_from_timestamp(cls, gmtime, timestamp);
+	return result;
+}
+
+/* Return best possible local time -- this isn't constrained by the
+ * precision of a timestamp.
+ */
+static PyObject *
+datetime_now(PyObject *cls, PyObject *dummy)
+{
+	return datetime_best_possible(cls, localtime);
+}
+
+/* Return best possible UTC time -- this isn't constrained by the
+ * precision of a timestamp.
+ */
+static PyObject *
+datetime_utcnow(PyObject *cls, PyObject *dummy)
+{
+	return datetime_best_possible(cls, gmtime);
+}
+
+/* Return new datetime or datetimetz from date/datetime/datetimetz and
+ * time/timetz arguments.
+ */
+static PyObject *
+datetime_combine(PyObject *cls, PyObject *args, PyObject *kw)
+{
+ 	static char *keywords[] = {"date", "time", NULL};
+	PyObject *date;
+	PyObject *time;
+	PyObject *result = NULL;
+
+	if (PyArg_ParseTupleAndKeywords(args, kw, "O!O!:combine", keywords,
+					&PyDateTime_DateType, &date,
+					&PyDateTime_TimeType, &time))
+		result = PyObject_CallFunction(cls, "iiiiiii",
+						GET_YEAR(date),
+				    		GET_MONTH(date),
+						GET_DAY(date),
+				    		TIME_GET_HOUR(time),
+				    		TIME_GET_MINUTE(time),
+				    		TIME_GET_SECOND(time),
+				    		TIME_GET_MICROSECOND(time));
+	if (result && PyTimeTZ_Check(time) && PyDateTimeTZ_Check(result)) {
+		/* Copy the tzinfo field. */
+		PyObject *tzinfo = ((PyDateTime_TimeTZ *)time)->tzinfo;
+		Py_INCREF(tzinfo);
+		Py_DECREF(((PyDateTime_DateTimeTZ *)result)->tzinfo);
+		((PyDateTime_DateTimeTZ *)result)->tzinfo = tzinfo;
+	}
+	return result;
+}
+
+/* datetime arithmetic. */
+
+static PyObject *
+add_datetime_timedelta(PyDateTime_DateTime *date, PyDateTime_Delta *delta)
+{
+	/* Note that the C-level additions can't overflow, because of
+	 * invariant bounds on the member values.
+	 */
+	int year = GET_YEAR(date);
+	int month = GET_MONTH(date);
+	int day = GET_DAY(date) + GET_TD_DAYS(delta);
+	int hour = DATE_GET_HOUR(date);
+	int minute = DATE_GET_MINUTE(date);
+	int second = DATE_GET_SECOND(date) + GET_TD_SECONDS(delta);
+	int microsecond = DATE_GET_MICROSECOND(date) +
+			  GET_TD_MICROSECONDS(delta);
+
+	if (normalize_datetime(&year, &month, &day,
+			       &hour, &minute, &second, &microsecond) < 0)
+		return NULL;
+	else
+		return new_datetime(year, month, day,
+				    hour, minute, second, microsecond);
+}
+
+static PyObject *
+sub_datetime_timedelta(PyDateTime_DateTime *date, PyDateTime_Delta *delta)
+{
+	/* Note that the C-level subtractions can't overflow, because of
+	 * invariant bounds on the member values.
+	 */
+	int year = GET_YEAR(date);
+	int month = GET_MONTH(date);
+	int day = GET_DAY(date) - GET_TD_DAYS(delta);
+	int hour = DATE_GET_HOUR(date);
+	int minute = DATE_GET_MINUTE(date);
+	int second = DATE_GET_SECOND(date) - GET_TD_SECONDS(delta);
+	int microsecond = DATE_GET_MICROSECOND(date) -
+			  GET_TD_MICROSECONDS(delta);
+
+	if (normalize_datetime(&year, &month, &day,
+			       &hour, &minute, &second, &microsecond) < 0)
+		return NULL;
+	else
+		return new_datetime(year, month, day,
+				    hour, minute, second, microsecond);
+}
+
+static PyObject *
+sub_datetime_datetime(PyDateTime_DateTime *left, PyDateTime_DateTime *right)
+{
+	int days1 = ymd_to_ord(GET_YEAR(left), GET_MONTH(left), GET_DAY(left));
+	int days2 = ymd_to_ord(GET_YEAR(right),
+			       GET_MONTH(right),
+			       GET_DAY(right));
+	/* These can't overflow, since the values are normalized.  At most
+	 * this gives the number of seconds in one day.
+	 */
+	int delta_s = (DATE_GET_HOUR(left) - DATE_GET_HOUR(right)) * 3600 +
+	              (DATE_GET_MINUTE(left) - DATE_GET_MINUTE(right)) * 60 +
+		      DATE_GET_SECOND(left) - DATE_GET_SECOND(right);
+	int delta_us = DATE_GET_MICROSECOND(left) -
+		       DATE_GET_MICROSECOND(right);
+
+	return new_delta(days1 - days2, delta_s, delta_us, 1);
+}
+
+static PyObject *
+datetime_add(PyObject *left, PyObject *right)
+{
+	if (PyDateTime_Check(left)) {
+		/* datetime + ??? */
+		if (PyDelta_Check(right))
+			/* datetime + delta */
+			return add_datetime_timedelta(
+					(PyDateTime_DateTime *)left,
+					(PyDateTime_Delta *)right);
+	}
+	else if (PyDelta_Check(left)) {
+		/* delta + datetime */
+		return add_datetime_timedelta((PyDateTime_DateTime *) right,
+					      (PyDateTime_Delta *) left);
+	}
+	Py_INCREF(Py_NotImplemented);
+	return Py_NotImplemented;
+}
+
+static PyObject *
+datetime_subtract(PyObject *left, PyObject *right)
+{
+	PyObject *result = Py_NotImplemented;
+
+	if (PyDateTime_Check(left)) {
+		/* datetime - ??? */
+		if (PyDateTime_Check(right)) {
+			/* datetime - datetime */
+			result = sub_datetime_datetime(
+					(PyDateTime_DateTime *)left,
+					(PyDateTime_DateTime *)right);
+		}
+		else if (PyDelta_Check(right)) {
+			/* datetime - delta */
+			result = sub_datetime_timedelta(
+					(PyDateTime_DateTime *)left,
+					(PyDateTime_Delta *)right);
+		}
+	}
+
+	if (result == Py_NotImplemented)
+		Py_INCREF(result);
+	return result;
+}
+
+/* Various ways to turn a datetime into a string. */
+
+static PyObject *
+datetime_repr(PyDateTime_DateTime *self)
+{
+	char buffer[1000];
+	char *typename = self->ob_type->tp_name;
+
+	if (DATE_GET_MICROSECOND(self)) {
+		PyOS_snprintf(buffer, sizeof(buffer),
+			      "%s(%d, %d, %d, %d, %d, %d, %d)",
+			      typename,
+			      GET_YEAR(self), GET_MONTH(self), GET_DAY(self),
+			      DATE_GET_HOUR(self), DATE_GET_MINUTE(self),
+			      DATE_GET_SECOND(self),
+			      DATE_GET_MICROSECOND(self));
+	}
+	else if (DATE_GET_SECOND(self)) {
+		PyOS_snprintf(buffer, sizeof(buffer),
+			      "%s(%d, %d, %d, %d, %d, %d)",
+			      typename,
+			      GET_YEAR(self), GET_MONTH(self), GET_DAY(self),
+			      DATE_GET_HOUR(self), DATE_GET_MINUTE(self),
+			      DATE_GET_SECOND(self));
+	}
+	else {
+		PyOS_snprintf(buffer, sizeof(buffer),
+			      "%s(%d, %d, %d, %d, %d)",
+			      typename,
+			      GET_YEAR(self), GET_MONTH(self), GET_DAY(self),
+			      DATE_GET_HOUR(self), DATE_GET_MINUTE(self));
+	}
+	return PyString_FromString(buffer);
+}
+
+static PyObject *
+datetime_str(PyDateTime_DateTime *self)
+{
+	return PyObject_CallMethod((PyObject *)self, "isoformat", "(s)", " ");
+}
+
+static PyObject *
+datetime_isoformat(PyDateTime_DateTime *self,
+                   PyObject *args, PyObject *kw)
+{
+	char sep = 'T';
+	static char *keywords[] = {"sep", NULL};
+	char buffer[100];
+	char *cp;
+
+	if (!PyArg_ParseTupleAndKeywords(args, kw, "|c:isoformat", keywords,
+					 &sep))
+		return NULL;
+	cp = isoformat_date((PyDateTime_Date *)self, buffer, sizeof(buffer));
+	assert(cp != NULL);
+	*cp++ = sep;
+	isoformat_time(self, cp, sizeof(buffer) - (cp - buffer));
+	return PyString_FromString(buffer);
+}
+
+static PyObject *
+datetime_ctime(PyDateTime_DateTime *self)
+{
+	return format_ctime((PyDateTime_Date *)self,
+			    DATE_GET_HOUR(self),
+			    DATE_GET_MINUTE(self),
+			    DATE_GET_SECOND(self));
+}
+
+/* Miscellaneous methods. */
+
+/* This is more natural as a tp_compare, but doesn't work then:  for whatever
+ * reason, Python's try_3way_compare ignores tp_compare unless
+ * PyInstance_Check returns true, but these aren't old-style classes.
+ * Note that this routine handles all comparisons for datetime and datetimetz.
+ */
+static PyObject *
+datetime_richcompare(PyDateTime_DateTime *self, PyObject *other, int op)
+{
+	int diff;
+	naivety n1, n2;
+	int offset1, offset2;
+
+	if (! PyDateTime_Check(other)) {
+		/* Stop this from falling back to address comparison. */
+		PyErr_Format(PyExc_TypeError,
+			     "can't compare '%s' to '%s'",
+			     self->ob_type->tp_name,
+			     other->ob_type->tp_name);
+		return NULL;
+	}
+	n1 = classify_object((PyObject *)self, &offset1);
+	assert(n1 != OFFSET_UNKNOWN);
+	if (n1 == OFFSET_ERROR)
+		return NULL;
+
+	n2 = classify_object(other, &offset2);
+	assert(n2 != OFFSET_UNKNOWN);
+	if (n2 == OFFSET_ERROR)
+		return NULL;
+
+	/* If they're both naive, or both aware and have the same offsets,
+	 * we get off cheap.  Note that if they're both naive, offset1 ==
+	 * offset2 == 0 at this point.
+	 */
+	if (n1 == n2 && offset1 == offset2) {
+		diff = memcmp(self->data, ((PyDateTime_DateTime *)other)->data,
+			      _PyDateTime_DATETIME_DATASIZE);
+		return diff_to_bool(diff, op);
+	}
+
+	if (n1 == OFFSET_AWARE && n2 == OFFSET_AWARE) {
+		/* We want the sign of
+		 *     (self - offset1 minutes) - (other - offset2 minutes) =
+		 *     (self - other) + (offset2 - offset1) minutes.
+		 */
+		PyDateTime_Delta *delta;
+		int days, seconds, us;
+
+		assert(offset1 != offset2);	/* else last "if" handled it */
+		delta = (PyDateTime_Delta *)sub_datetime_datetime(self,
+						(PyDateTime_DateTime *)other);
+		if (delta == NULL)
+			return NULL;
+		days = delta->days;
+		seconds = delta->seconds + (offset2 - offset1) * 60;
+		us = delta->microseconds;
+		Py_DECREF(delta);
+		normalize_d_s_us(&days, &seconds, &us);
+		diff = days;
+		if (diff == 0)
+			diff = seconds | us;
+		return diff_to_bool(diff, op);
+	}
+
+	assert(n1 != n2);
+	PyErr_SetString(PyExc_TypeError,
+			"can't compare offset-naive and "
+			"offset-aware datetimes");
+	return NULL;
+}
+
+static PyObject *datetime_getstate(PyDateTime_DateTime *self);
+
+static long
+datetime_hash(PyDateTime_DateTime *self)
+{
+	if (self->hashcode == -1) {
+		naivety n;
+		int offset;
+		PyObject *temp;
+
+		n = classify_object((PyObject *)self, &offset);
+		assert(n != OFFSET_UNKNOWN);
+		if (n == OFFSET_ERROR)
+			return -1;
+
+		/* Reduce this to a hash of another object. */
+		if (n == OFFSET_NAIVE)
+			temp = datetime_getstate(self);
+		else {
+			int days;
+			int seconds;
+
+			assert(n == OFFSET_AWARE);
+			assert(PyDateTimeTZ_Check(self));
+			days = ymd_to_ord(GET_YEAR(self),
+					  GET_MONTH(self),
+					  GET_DAY(self));
+			seconds = DATE_GET_HOUR(self) * 3600 +
+				  (DATE_GET_MINUTE(self) - offset) * 60 +
+				  DATE_GET_SECOND(self);
+			temp = new_delta(days,
+					 seconds,
+					 DATE_GET_MICROSECOND(self),
+					 1);
+		}
+		if (temp != NULL) {
+			self->hashcode = PyObject_Hash(temp);
+			Py_DECREF(temp);
+		}
+	}
+	return self->hashcode;
+}
+
+static PyObject *
+datetime_timetuple(PyDateTime_DateTime *self)
+{
+	return build_struct_time(GET_YEAR(self),
+				 GET_MONTH(self),
+				 GET_DAY(self),
+				 DATE_GET_HOUR(self),
+				 DATE_GET_MINUTE(self),
+				 DATE_GET_SECOND(self),
+				 -1);
+}
+
+static PyObject *
+datetime_getdate(PyDateTime_DateTime *self)
+{
+	return new_date(GET_YEAR(self),
+			GET_MONTH(self),
+			GET_DAY(self));
+}
+
+static PyObject *
+datetime_gettime(PyDateTime_DateTime *self)
+{
+	return new_time(DATE_GET_HOUR(self),
+			DATE_GET_MINUTE(self),
+			DATE_GET_SECOND(self),
+			DATE_GET_MICROSECOND(self));
+}
+
+/* Pickle support.  Quite a maze! */
+
+static PyObject *
+datetime_getstate(PyDateTime_DateTime *self)
+{
+	return PyString_FromStringAndSize(self->data,
+					  _PyDateTime_DATETIME_DATASIZE);
+}
+
+static PyObject *
+datetime_setstate(PyDateTime_DateTime *self, PyObject *state)
+{
+	const int len = PyString_Size(state);
+	unsigned char *pdata = (unsigned char*)PyString_AsString(state);
+
+	if (! PyString_Check(state) ||
+	    len != _PyDateTime_DATETIME_DATASIZE) {
+		PyErr_SetString(PyExc_TypeError,
+				"bad argument to datetime.__setstate__");
+		return NULL;
+	}
+	memcpy(self->data, pdata, _PyDateTime_DATETIME_DATASIZE);
+	self->hashcode = -1;
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+/* XXX This seems a ridiculously inefficient way to pickle a short string. */
+static PyObject *
+datetime_pickler(PyObject *module, PyDateTime_DateTime *datetime)
+{
+	PyObject *state;
+	PyObject *result = NULL;
+
+	if (! PyDateTime_CheckExact(datetime)) {
+		PyErr_Format(PyExc_TypeError,
+			     "bad type passed to datetime pickler: %s",
+			     datetime->ob_type->tp_name);
+		return NULL;
+	}
+	state = datetime_getstate(datetime);
+	if (state) {
+		result = Py_BuildValue("O(O)",
+				       datetime_unpickler_object,
+				       state);
+		Py_DECREF(state);
+	}
+	return result;
+}
+
+static PyObject *
+datetime_unpickler(PyObject *module, PyObject *arg)
+{
+	PyDateTime_DateTime *self;
+
+	if (! PyString_CheckExact(arg)) {
+		PyErr_Format(PyExc_TypeError,
+			     "bad type passed to datetime unpickler: %s",
+			     arg->ob_type->tp_name);
+		return NULL;
+	}
+	self = PyObject_New(PyDateTime_DateTime, &PyDateTime_DateTimeType);
+	if (self != NULL) {
+		PyObject *res = datetime_setstate(self, arg);
+		if (res == NULL) {
+			Py_DECREF(self);
+			return NULL;
+		}
+		Py_DECREF(res);
+	}
+	return (PyObject *)self;
+}
+
+static PyMethodDef datetime_methods[] = {
+	/* Class methods: */
+	{"now",         (PyCFunction)datetime_now,
+	 METH_NOARGS | METH_CLASS,
+	 PyDoc_STR("Return a new datetime representing local day and time.")},
+
+	{"utcnow",         (PyCFunction)datetime_utcnow,
+	 METH_NOARGS | METH_CLASS,
+	 PyDoc_STR("Return a new datetime representing UTC day and time.")},
+
+	{"fromtimestamp", (PyCFunction)datetime_fromtimestamp,
+	 METH_VARARGS | METH_CLASS,
+	 PyDoc_STR("timestamp -> local datetime from a POSIX timestamp "
+	 	   "(like time.time()).")},
+
+	{"utcfromtimestamp", (PyCFunction)datetime_utcfromtimestamp,
+	 METH_VARARGS | METH_CLASS,
+	 PyDoc_STR("timestamp -> UTC datetime from a POSIX timestamp "
+	 	   "(like time.time()).")},
+
+	{"combine", (PyCFunction)datetime_combine,
+	 METH_VARARGS | METH_KEYWORDS | METH_CLASS,
+	 PyDoc_STR("date, time -> datetime with same date and time fields")},
+
+	/* Instance methods: */
+	{"timetuple",   (PyCFunction)datetime_timetuple, METH_NOARGS,
+         PyDoc_STR("Return time tuple, compatible with time.localtime().")},
+
+	{"date",   (PyCFunction)datetime_getdate, METH_NOARGS,
+         PyDoc_STR("Return date object with same year, month and day.")},
+
+	{"time",   (PyCFunction)datetime_gettime, METH_NOARGS,
+         PyDoc_STR("Return time object with same hour, minute, second and "
+         	   "microsecond.")},
+
+	{"ctime",       (PyCFunction)datetime_ctime,	METH_NOARGS,
+	 PyDoc_STR("Return ctime() style string.")},
+
+	{"isoformat",   (PyCFunction)datetime_isoformat, METH_KEYWORDS,
+	 PyDoc_STR("[sep] -> string in ISO 8601 format, "
+	 	   "YYYY-MM-DDTHH:MM:SS[.mmmmmm].\n\n"
+	 	   "sep is used to separate the year from the time, and "
+	 	   "defaults\n"
+	 	   "to 'T'.")},
+
+	{"__setstate__", (PyCFunction)datetime_setstate, METH_O,
+	 PyDoc_STR("__setstate__(state)")},
+
+	{"__getstate__", (PyCFunction)datetime_getstate, METH_NOARGS,
+	 PyDoc_STR("__getstate__() -> state")},
+	{NULL,	NULL}
+};
+
+static char datetime_doc[] =
+PyDoc_STR("Basic date/time type.");
+
+static PyNumberMethods datetime_as_number = {
+	datetime_add,				/* nb_add */
+	datetime_subtract,			/* nb_subtract */
+	0,					/* nb_multiply */
+	0,					/* nb_divide */
+	0,					/* nb_remainder */
+	0,					/* nb_divmod */
+	0,					/* nb_power */
+	0,					/* nb_negative */
+	0,					/* nb_positive */
+	0,					/* nb_absolute */
+	0,					/* nb_nonzero */
+};
+
+statichere PyTypeObject PyDateTime_DateTimeType = {
+	PyObject_HEAD_INIT(NULL)
+	0,					/* ob_size */
+	"datetime.datetime",			/* tp_name */
+	sizeof(PyDateTime_DateTime),		/* tp_basicsize */
+	0,					/* tp_itemsize */
+	(destructor)PyObject_Del,		/* tp_dealloc */
+	0,					/* tp_print */
+	0,					/* tp_getattr */
+	0,					/* tp_setattr */
+	0,					/* tp_compare */
+	(reprfunc)datetime_repr,		/* tp_repr */
+	&datetime_as_number,			/* tp_as_number */
+	0,					/* tp_as_sequence */
+	0,					/* tp_as_mapping */
+	(hashfunc)datetime_hash,		/* tp_hash */
+	0,              			/* tp_call */
+	(reprfunc)datetime_str,			/* tp_str */
+	PyObject_GenericGetAttr,		/* tp_getattro */
+	0,					/* tp_setattro */
+	0,					/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES |
+        Py_TPFLAGS_BASETYPE,			/* tp_flags */
+	datetime_doc,				/* tp_doc */
+	0,					/* tp_traverse */
+	0,					/* tp_clear */
+	(richcmpfunc)datetime_richcompare,	/* tp_richcompare */
+	0,					/* tp_weaklistoffset */
+	0,					/* tp_iter */
+	0,					/* tp_iternext */
+	datetime_methods,			/* tp_methods */
+	0,					/* tp_members */
+	datetime_getset,			/* tp_getset */
+	&PyDateTime_DateType,			/* tp_base */
+	0,					/* tp_dict */
+	0,					/* tp_descr_get */
+	0,					/* tp_descr_set */
+	0,					/* tp_dictoffset */
+	0,					/* tp_init */
+	0,					/* tp_alloc */
+	datetime_new,				/* tp_new */
+	_PyObject_Del,				/* tp_free */
+};
+
+/*
+ * PyDateTime_Time implementation.
+ */
+
+/* Accessor properties. */
+
+static PyObject *
+time_hour(PyDateTime_Time *self, void *unused)
+{
+	return PyInt_FromLong(TIME_GET_HOUR(self));
+}
+
+static PyObject *
+time_minute(PyDateTime_Time *self, void *unused)
+{
+	return PyInt_FromLong(TIME_GET_MINUTE(self));
+}
+
+static PyObject *
+time_second(PyDateTime_Time *self, void *unused)
+{
+	return PyInt_FromLong(TIME_GET_SECOND(self));
+}
+
+static PyObject *
+time_microsecond(PyDateTime_Time *self, void *unused)
+{
+	return PyInt_FromLong(TIME_GET_MICROSECOND(self));
+}
+
+static PyGetSetDef time_getset[] = {
+	{"hour",        (getter)time_hour},
+	{"minute",      (getter)time_minute},
+	{"second",      (getter)time_second},
+	{"microsecond", (getter)time_microsecond},
+	{NULL}
+};
+
+/* Constructors. */
+
+static PyObject *
+time_new(PyTypeObject *type, PyObject *args, PyObject *kw)
+{
+	PyObject *self = NULL;
+	int hour = 0;
+	int minute = 0;
+	int second = 0;
+	int usecond = 0;
+
+	static char *keywords[] = {
+		"hour", "minute", "second", "microsecond", NULL
+	};
+
+	if (PyArg_ParseTupleAndKeywords(args, kw, "|iiii", keywords,
+					&hour, &minute, &second, &usecond)) {
+		if (check_time_args(hour, minute, second, usecond) < 0)
+			return NULL;
+		self = new_time(hour, minute, second, usecond);
+	}
+	return self;
+}
+
+/* Various ways to turn a time into a string. */
+
+static PyObject *
+time_repr(PyDateTime_Time *self)
+{
+	char buffer[100];
+	char *typename = self->ob_type->tp_name;
+	int h = TIME_GET_HOUR(self);
+	int m = TIME_GET_MINUTE(self);
+	int s = TIME_GET_SECOND(self);
+	int us = TIME_GET_MICROSECOND(self);
+
+	if (us)
+		PyOS_snprintf(buffer, sizeof(buffer),
+			      "%s(%d, %d, %d, %d)", typename, h, m, s, us);
+	else if (s)
+		PyOS_snprintf(buffer, sizeof(buffer),
+			      "%s(%d, %d, %d)", typename, h, m, s);
+	else
+		PyOS_snprintf(buffer, sizeof(buffer),
+			      "%s(%d, %d)", typename, h, m);
+	return PyString_FromString(buffer);
+}
+
+static PyObject *
+time_str(PyDateTime_Time *self)
+{
+	return PyObject_CallMethod((PyObject *)self, "isoformat", "()");
+}
+
+static PyObject *
+time_isoformat(PyDateTime_Time *self)
+{
+	char buffer[100];
+	/* Reuse the time format code from the datetime type. */
+	PyDateTime_DateTime datetime;
+	PyDateTime_DateTime *pdatetime = &datetime;
+
+	/* Copy over just the time bytes. */
+	memcpy(pdatetime->data + _PyDateTime_DATE_DATASIZE,
+	       self->data,
+	       _PyDateTime_TIME_DATASIZE);
+
+	isoformat_time(pdatetime, buffer, sizeof(buffer));
+	return PyString_FromString(buffer);
+}
+
+static PyObject *
+time_strftime(PyDateTime_Time *self, PyObject *args, PyObject *kw)
+{
+	PyObject *result;
+	PyObject *format;
+	PyObject *tuple;
+	static char *keywords[] = {"format", NULL};
+
+	if (! PyArg_ParseTupleAndKeywords(args, kw, "O!:strftime", keywords,
+					  &PyString_Type, &format))
+		return NULL;
+
+	tuple = Py_BuildValue("iiiiiiiii",
+		              0, 0, 0, /* year, month, day */
+			      TIME_GET_HOUR(self),
+			      TIME_GET_MINUTE(self),
+			      TIME_GET_SECOND(self),
+			      0, 0, -1); /* weekday, daynum, dst */
+	if (tuple == NULL)
+		return NULL;
+	assert(PyTuple_Size(tuple) == 9);
+	result = wrap_strftime((PyObject *)self, format, tuple);
+	Py_DECREF(tuple);
+	return result;
+}
+
+/* Miscellaneous methods. */
+
+/* This is more natural as a tp_compare, but doesn't work then:  for whatever
+ * reason, Python's try_3way_compare ignores tp_compare unless
+ * PyInstance_Check returns true, but these aren't old-style classes.
+ * Note that this routine handles all comparisons for time and timetz.
+ */
+static PyObject *
+time_richcompare(PyDateTime_Time *self, PyObject *other, int op)
+{
+	int diff;
+	naivety n1, n2;
+	int offset1, offset2;
+
+	if (! PyTime_Check(other)) {
+		/* Stop this from falling back to address comparison. */
+		PyErr_Format(PyExc_TypeError,
+			     "can't compare '%s' to '%s'",
+			     self->ob_type->tp_name,
+			     other->ob_type->tp_name);
+		return NULL;
+	}
+	n1 = classify_object((PyObject *)self, &offset1);
+	assert(n1 != OFFSET_UNKNOWN);
+	if (n1 == OFFSET_ERROR)
+		return NULL;
+
+	n2 = classify_object(other, &offset2);
+	assert(n2 != OFFSET_UNKNOWN);
+	if (n2 == OFFSET_ERROR)
+		return NULL;
+
+	/* If they're both naive, or both aware and have the same offsets,
+	 * we get off cheap.  Note that if they're both naive, offset1 ==
+	 * offset2 == 0 at this point.
+	 */
+	if (n1 == n2 && offset1 == offset2) {
+		diff = memcmp(self->data, ((PyDateTime_Time *)other)->data,
+			      _PyDateTime_TIME_DATASIZE);
+		return diff_to_bool(diff, op);
+	}
+
+	if (n1 == OFFSET_AWARE && n2 == OFFSET_AWARE) {
+		assert(offset1 != offset2);	/* else last "if" handled it */
+		/* Convert everything except microseconds to seconds.  These
+		 * can't overflow (no more than the # of seconds in 2 days).
+		 */
+		offset1 = TIME_GET_HOUR(self) * 3600 +
+			  (TIME_GET_MINUTE(self) - offset1) * 60 +
+			  TIME_GET_SECOND(self);
+		offset2 = TIME_GET_HOUR(other) * 3600 +
+			  (TIME_GET_MINUTE(other) - offset2) * 60 +
+			  TIME_GET_SECOND(other);
+		diff = offset1 - offset2;
+		if (diff == 0)
+			diff = TIME_GET_MICROSECOND(self) -
+			       TIME_GET_MICROSECOND(other);
+		return diff_to_bool(diff, op);
+	}
+
+	assert(n1 != n2);
+	PyErr_SetString(PyExc_TypeError,
+			"can't compare offset-naive and "
+			"offset-aware times");
+	return NULL;
+}
+
+static PyObject *time_getstate(PyDateTime_Time *self);
+
+static long
+time_hash(PyDateTime_Time *self)
+{
+	if (self->hashcode == -1) {
+		naivety n;
+		int offset;
+		PyObject *temp;
+
+		n = classify_object((PyObject *)self, &offset);
+		assert(n != OFFSET_UNKNOWN);
+		if (n == OFFSET_ERROR)
+			return -1;
+
+		/* Reduce this to a hash of another object. */
+		if (offset == 0)
+			temp = time_getstate(self);
+		else {
+			int hour;
+			int minute;
+
+			assert(n == OFFSET_AWARE);
+			assert(PyTimeTZ_Check(self));
+			hour = divmod(TIME_GET_HOUR(self) * 60 +
+					TIME_GET_MINUTE(self) - offset,
+				      60,
+				      &minute);
+			if (0 <= hour && hour < 24)
+				temp = new_time(hour, minute,
+						TIME_GET_SECOND(self),
+						TIME_GET_MICROSECOND(self));
+			else
+				temp = Py_BuildValue("iiii",
+					   hour, minute,
+					   TIME_GET_SECOND(self),
+					   TIME_GET_MICROSECOND(self));
+		}
+		if (temp != NULL) {
+			self->hashcode = PyObject_Hash(temp);
+			Py_DECREF(temp);
+		}
+	}
+	return self->hashcode;
+}
+
+static int
+time_nonzero(PyDateTime_Time *self)
+{
+	return TIME_GET_HOUR(self) ||
+	       TIME_GET_MINUTE(self) ||
+	       TIME_GET_SECOND(self) ||
+	       TIME_GET_MICROSECOND(self);
+}
+
+/* Pickle support.  Quite a maze! */
+
+static PyObject *
+time_getstate(PyDateTime_Time *self)
+{
+	return PyString_FromStringAndSize(self->data,
+					  _PyDateTime_TIME_DATASIZE);
+}
+
+static PyObject *
+time_setstate(PyDateTime_Time *self, PyObject *state)
+{
+	const int len = PyString_Size(state);
+	unsigned char *pdata = (unsigned char*)PyString_AsString(state);
+
+	if (! PyString_Check(state) ||
+	    len != _PyDateTime_TIME_DATASIZE) {
+		PyErr_SetString(PyExc_TypeError,
+				"bad argument to time.__setstate__");
+		return NULL;
+	}
+	memcpy(self->data, pdata, _PyDateTime_TIME_DATASIZE);
+	self->hashcode = -1;
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+/* XXX This seems a ridiculously inefficient way to pickle a short string. */
+static PyObject *
+time_pickler(PyObject *module, PyDateTime_Time *time)
+{
+	PyObject *state;
+	PyObject *result = NULL;
+
+	if (! PyTime_CheckExact(time)) {
+		PyErr_Format(PyExc_TypeError,
+			     "bad type passed to time pickler: %s",
+			     time->ob_type->tp_name);
+		return NULL;
+	}
+	state = time_getstate(time);
+	if (state) {
+		result = Py_BuildValue("O(O)",
+				       time_unpickler_object,
+				       state);
+		Py_DECREF(state);
+	}
+	return result;
+}
+
+static PyObject *
+time_unpickler(PyObject *module, PyObject *arg)
+{
+	PyDateTime_Time *self;
+
+	if (! PyString_CheckExact(arg)) {
+		PyErr_Format(PyExc_TypeError,
+			     "bad type passed to time unpickler: %s",
+			     arg->ob_type->tp_name);
+		return NULL;
+	}
+	self = PyObject_New(PyDateTime_Time, &PyDateTime_TimeType);
+	if (self != NULL) {
+		PyObject *res = time_setstate(self, arg);
+		if (res == NULL) {
+			Py_DECREF(self);
+			return NULL;
+		}
+		Py_DECREF(res);
+	}
+	return (PyObject *)self;
+}
+
+static PyMethodDef time_methods[] = {
+	{"isoformat",   (PyCFunction)time_isoformat,	METH_KEYWORDS,
+	 PyDoc_STR("Return string in ISO 8601 format, HH:MM:SS[.mmmmmm].")},
+
+	{"strftime",   	(PyCFunction)time_strftime,	METH_KEYWORDS,
+	 PyDoc_STR("format -> strftime() style string.")},
+
+	{"__setstate__", (PyCFunction)time_setstate,	METH_O,
+	 PyDoc_STR("__setstate__(state)")},
+
+	{"__getstate__", (PyCFunction)time_getstate,	METH_NOARGS,
+	 PyDoc_STR("__getstate__() -> state")},
+	{NULL,	NULL}
+};
+
+static char time_doc[] =
+PyDoc_STR("Basic time type.");
+
+static PyNumberMethods time_as_number = {
+	0,					/* nb_add */
+	0,					/* nb_subtract */
+	0,					/* nb_multiply */
+	0,					/* nb_divide */
+	0,					/* nb_remainder */
+	0,					/* nb_divmod */
+	0,					/* nb_power */
+	0,					/* nb_negative */
+	0,					/* nb_positive */
+	0,					/* nb_absolute */
+	(inquiry)time_nonzero,			/* nb_nonzero */
+};
+
+statichere PyTypeObject PyDateTime_TimeType = {
+	PyObject_HEAD_INIT(NULL)
+	0,					/* ob_size */
+	"datetime.time",			/* tp_name */
+	sizeof(PyDateTime_Time),		/* tp_basicsize */
+	0,					/* tp_itemsize */
+	(destructor)PyObject_Del,		/* tp_dealloc */
+	0,					/* tp_print */
+	0,					/* tp_getattr */
+	0,					/* tp_setattr */
+	0,					/* tp_compare */
+	(reprfunc)time_repr,			/* tp_repr */
+	&time_as_number,			/* tp_as_number */
+	0,					/* tp_as_sequence */
+	0,					/* tp_as_mapping */
+	(hashfunc)time_hash,			/* tp_hash */
+	0,              			/* tp_call */
+	(reprfunc)time_str,			/* tp_str */
+	PyObject_GenericGetAttr,		/* tp_getattro */
+	0,					/* tp_setattro */
+	0,					/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES |
+        Py_TPFLAGS_BASETYPE,			/* tp_flags */
+	time_doc,				/* tp_doc */
+	0,					/* tp_traverse */
+	0,					/* tp_clear */
+	(richcmpfunc)time_richcompare,		/* tp_richcompare */
+	0,					/* tp_weaklistoffset */
+	0,					/* tp_iter */
+	0,					/* tp_iternext */
+	time_methods,				/* tp_methods */
+	0,					/* tp_members */
+	time_getset,				/* tp_getset */
+	0,					/* tp_base */
+	0,					/* tp_dict */
+	0,					/* tp_descr_get */
+	0,					/* tp_descr_set */
+	0,					/* tp_dictoffset */
+	0,					/* tp_init */
+	0,					/* tp_alloc */
+	time_new,				/* tp_new */
+	_PyObject_Del,				/* tp_free */
+};
+
+/*
+ * PyDateTime_TZInfo implementation.
+ */
+
+/* This is a pure abstract base class, so doesn't do anything beyond
+ * raising NotImplemented exceptions.  Real tzinfo classes need
+ * to derive from this.  This is mostly for clarity, and for efficiency in
+ * datetimetz and timetz constructors (their tzinfo arguments need to
+ * be subclasses of this tzinfo class, which is easy and quick to check).
+ *
+ * Note:  For reasons having to do with pickling of subclasses, we have
+ * to allow tzinfo objects to be instantiated.  This wasn't an issue
+ * in the Python implementation (__init__() could raise NotImplementedError
+ * there without ill effect), but doing so in the C implementation hit a
+ * brick wall.
+ */
+
+static PyObject *
+tzinfo_nogo(const char* methodname)
+{
+	PyErr_Format(PyExc_NotImplementedError,
+		     "a tzinfo subclass must implement %s()",
+		     methodname);
+	return NULL;
+}
+
+/* Methods.  A subclass must implement these. */
+
+static PyObject*
+tzinfo_tzname(PyDateTime_TZInfo *self, PyObject *dt)
+{
+	return tzinfo_nogo("tzname");
+}
+
+static PyObject*
+tzinfo_utcoffset(PyDateTime_TZInfo *self, PyObject *dt)
+{
+	return tzinfo_nogo("utcoffset");
+}
+
+static PyObject*
+tzinfo_dst(PyDateTime_TZInfo *self, PyObject *dt)
+{
+	return tzinfo_nogo("dst");
+}
+
+/*
+ * Pickle support.  This is solely so that tzinfo subclasses can use
+ * pickling -- tzinfo itself is supposed to be uninstantiable.  The
+ * pickler and unpickler functions are given module-level private
+ * names, and registered with copy_reg, by the module init function.
+ */
+
+static PyObject*
+tzinfo_pickler(PyDateTime_TZInfo *self) {
+	return Py_BuildValue("O()", tzinfo_unpickler_object);
+}
+
+static PyObject*
+tzinfo_unpickler(PyObject * unused) {
+ 	return PyType_GenericNew(&PyDateTime_TZInfoType, NULL, NULL);
+}
+
+
+static PyMethodDef tzinfo_methods[] = {
+	{"tzname",	(PyCFunction)tzinfo_tzname,		METH_O,
+	 PyDoc_STR("datetime -> string name of time zone.")},
+
+	{"utcoffset",	(PyCFunction)tzinfo_utcoffset,		METH_O,
+	 PyDoc_STR("datetime -> minutes east of UTC (negative for "
+	 	   "west of UTC).")},
+
+	{"dst",		(PyCFunction)tzinfo_dst,		METH_O,
+	 PyDoc_STR("datetime -> DST offset in minutes east of UTC.")},
+
+	{NULL, NULL}
+};
+
+static char tzinfo_doc[] =
+PyDoc_STR("Abstract base class for time zone info objects.");
+
+ statichere PyTypeObject PyDateTime_TZInfoType = {
+	PyObject_HEAD_INIT(NULL)
+	0,					/* ob_size */
+	"datetime.tzinfo",			/* tp_name */
+	sizeof(PyDateTime_TZInfo),		/* tp_basicsize */
+	0,					/* tp_itemsize */
+	0,					/* tp_dealloc */
+	0,					/* tp_print */
+	0,					/* tp_getattr */
+	0,					/* tp_setattr */
+	0,					/* tp_compare */
+	0,					/* tp_repr */
+	0,					/* tp_as_number */
+	0,					/* tp_as_sequence */
+	0,					/* tp_as_mapping */
+	0,					/* tp_hash */
+	0,              			/* tp_call */
+	0,					/* tp_str */
+	PyObject_GenericGetAttr,		/* tp_getattro */
+	0,					/* tp_setattro */
+	0,					/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES |
+        Py_TPFLAGS_BASETYPE,			/* tp_flags */
+	tzinfo_doc,				/* tp_doc */
+	0,					/* tp_traverse */
+	0,					/* tp_clear */
+	0,					/* tp_richcompare */
+	0,					/* tp_weaklistoffset */
+	0,					/* tp_iter */
+	0,					/* tp_iternext */
+	tzinfo_methods,				/* tp_methods */
+	0,					/* tp_members */
+	0,					/* tp_getset */
+	0,					/* tp_base */
+	0,					/* tp_dict */
+	0,					/* tp_descr_get */
+	0,					/* tp_descr_set */
+	0,					/* tp_dictoffset */
+	0,					/* tp_init */
+	0,					/* tp_alloc */
+	PyType_GenericNew,			/* tp_new */
+	0,					/* tp_free */
+};
+
+/*
+ * PyDateTime_TimeTZ implementation.
+ */
+
+/* Accessor properties.  Properties for hour, minute, second and microsecond
+ * are inherited from time.
+ */
+
+static PyObject *
+timetz_tzinfo(PyDateTime_TimeTZ *self, void *unused)
+{
+	Py_INCREF(self->tzinfo);
+	return self->tzinfo;
+}
+
+static PyGetSetDef timetz_getset[] = {
+	{"tzinfo", (getter)timetz_tzinfo},
+	{NULL}
+};
+
+/*
+ * Constructors.
+ */
+
+static PyObject *
+timetz_new(PyTypeObject *type, PyObject *args, PyObject *kw)
+{
+	PyObject *self = NULL;
+	int hour = 0;
+	int minute = 0;
+	int second = 0;
+	int usecond = 0;
+	PyObject *tzinfo = Py_None;
+
+	static char *keywords[] = {
+		"hour", "minute", "second", "microsecond", "tzinfo", NULL
+	};
+
+	if (PyArg_ParseTupleAndKeywords(args, kw, "|llllO", keywords,
+					&hour, &minute, &second, &usecond,
+					&tzinfo)) {
+		if (check_time_args(hour, minute, second, usecond) < 0)
+			return NULL;
+		if (check_tzinfo_subclass(tzinfo) < 0)
+			return NULL;
+		self = new_timetz(hour, minute, second, usecond, tzinfo);
+	}
+	return self;
+}
+
+/*
+ * Destructor.
+ */
+
+static void
+timetz_dealloc(PyDateTime_TimeTZ *self)
+{
+	Py_XDECREF(self->tzinfo);
+	self->ob_type->tp_free((PyObject *)self);
+}
+
+/*
+ * Indirect access to tzinfo methods.  One more "convenience function" and
+ * it won't be possible to find the useful methods anymore <0.5 wink>.
+ */
+
+static PyObject *
+timetz_convienience(PyDateTime_TimeTZ *self, char *name)
+{
+	PyObject *result;
+
+	if (self->tzinfo == Py_None) {
+		result = Py_None;
+		Py_INCREF(result);
+	}
+	else
+		result = PyObject_CallMethod(self->tzinfo, name, "O", self);
+	return result;
+}
+
+/* These are all METH_NOARGS, so don't need to check the arglist. */
+static PyObject *
+timetz_utcoffset(PyDateTime_TimeTZ *self, PyObject *unused) {
+	return timetz_convienience(self, "utcoffset");
+}
+
+static PyObject *
+timetz_tzname(PyDateTime_TimeTZ *self, PyObject *unused) {
+	return timetz_convienience(self, "tzname");
+}
+
+static PyObject *
+timetz_dst(PyDateTime_TimeTZ *self, PyObject *unused) {
+	return timetz_convienience(self, "dst");
+}
+
+/*
+ * Various ways to turn a timetz into a string.
+ */
+
+static PyObject *
+timetz_repr(PyDateTime_TimeTZ *self)
+{
+	PyObject *baserepr = time_repr((PyDateTime_Time *)self);
+
+	if (baserepr == NULL)
+		return NULL;
+	return append_keyword_tzinfo(baserepr, self->tzinfo);
+}
+
+/* Note:  tp_str is inherited from time. */
+
+static PyObject *
+timetz_isoformat(PyDateTime_TimeTZ *self)
+{
+	char buf[100];
+	PyObject *result = time_isoformat((PyDateTime_Time *)self);
+
+	if (result == NULL || self->tzinfo == Py_None)
+		return result;
+
+	/* We need to append the UTC offset. */
+	if (format_utcoffset(buf, sizeof(buf), ":", self->tzinfo,
+			     (PyObject *)self) < 0) {
+		Py_DECREF(result);
+		return NULL;
+	}
+	PyString_ConcatAndDel(&result, PyString_FromString(buf));
+	return result;
+}
+
+/* Note:  strftime() is inherited from time. */
+
+/*
+ * Miscellaneous methods.
+ */
+
+/* Note:  tp_richcompare and tp_hash are inherited from time. */
+
+static int
+timetz_nonzero(PyDateTime_TimeTZ *self)
+{
+	int offset;
+	int none;
+
+	if (TIME_GET_SECOND(self) || TIME_GET_MICROSECOND(self)) {
+		/* Since utcoffset is in whole minutes, nothing can
+		 * alter the conclusion that this is nonzero.
+		 */
+		return 1;
+	}
+	offset = 0;
+	if (self->tzinfo != Py_None) {
+		offset = call_utcoffset(self->tzinfo, (PyObject *)self, &none);
+		if (offset == -1 && PyErr_Occurred())
+			return -1;
+	}
+	return (TIME_GET_MINUTE(self) - offset + TIME_GET_HOUR(self)*60) != 0;
+}
+
+/*
+ * Pickle support.  Quite a maze!
+ */
+
+/* Let basestate be the state string returned by time_getstate.
+ * If tzinfo is None, this returns (basestate,), else (basestate, tzinfo).
+ * So it's a tuple in any (non-error) case.
+ */
+static PyObject *
+timetz_getstate(PyDateTime_TimeTZ *self)
+{
+	PyObject *basestate;
+	PyObject *result = NULL;
+
+	basestate = time_getstate((PyDateTime_Time *)self);
+	if (basestate != NULL) {
+		if (self->tzinfo == Py_None)
+			result = Py_BuildValue("(O)", basestate);
+		else
+			result = Py_BuildValue("OO", basestate, self->tzinfo);
+		Py_DECREF(basestate);
+	}
+	return result;
+}
+
+static PyObject *
+timetz_setstate(PyDateTime_TimeTZ *self, PyObject *state)
+{
+	PyObject *temp;
+	PyObject *basestate;
+	PyObject *tzinfo = Py_None;
+
+	if (! PyArg_ParseTuple(state, "O!|O:__setstate__",
+			       &PyString_Type, &basestate,
+			       &tzinfo))
+		return NULL;
+	temp = time_setstate((PyDateTime_Time *)self, basestate);
+	if (temp == NULL)
+		return NULL;
+	Py_DECREF(temp);
+
+	Py_INCREF(tzinfo);
+	Py_XDECREF(self->tzinfo);
+	self->tzinfo = tzinfo;
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+static PyObject *
+timetz_pickler(PyObject *module, PyDateTime_TimeTZ *timetz)
+{
+	PyObject *state;
+	PyObject *result = NULL;
+
+	if (! PyTimeTZ_CheckExact(timetz)) {
+		PyErr_Format(PyExc_TypeError,
+			     "bad type passed to timetz pickler: %s",
+			     timetz->ob_type->tp_name);
+		return NULL;
+	}
+	state = timetz_getstate(timetz);
+	if (state) {
+		result = Py_BuildValue("O(O)",
+				       timetz_unpickler_object,
+				       state);
+		Py_DECREF(state);
+	}
+	return result;
+}
+
+static PyObject *
+timetz_unpickler(PyObject *module, PyObject *arg)
+{
+	PyDateTime_TimeTZ *self;
+
+	self = PyObject_New(PyDateTime_TimeTZ, &PyDateTime_TimeTZType);
+	if (self != NULL) {
+		PyObject *res;
+
+		self->tzinfo = NULL;
+		res = timetz_setstate(self, arg);
+		if (res == NULL) {
+			Py_DECREF(self);
+			return NULL;
+		}
+		Py_DECREF(res);
+	}
+	return (PyObject *)self;
+}
+
+static PyMethodDef timetz_methods[] = {
+	{"isoformat",   (PyCFunction)timetz_isoformat,	METH_KEYWORDS,
+	 PyDoc_STR("Return string in ISO 8601 format, HH:MM:SS[.mmmmmm]"
+	 	   "[+HH:MM].")},
+
+	{"utcoffset",	(PyCFunction)timetz_utcoffset,	METH_NOARGS,
+	 PyDoc_STR("Return self.tzinfo.utcoffset(self).")},
+
+	{"tzname",	(PyCFunction)timetz_tzname,	METH_NOARGS,
+	 PyDoc_STR("Return self.tzinfo.tzname(self).")},
+
+	{"dst",		(PyCFunction)timetz_dst,	METH_NOARGS,
+	 PyDoc_STR("Return self.tzinfo.dst(self).")},
+
+	{"__setstate__", (PyCFunction)timetz_setstate,	METH_O,
+	 PyDoc_STR("__setstate__(state)")},
+
+	{"__getstate__", (PyCFunction)timetz_getstate,	METH_NOARGS,
+	 PyDoc_STR("__getstate__() -> state")},
+	{NULL,	NULL}
+
+};
+
+static char timetz_doc[] =
+PyDoc_STR("Time type.");
+
+static PyNumberMethods timetz_as_number = {
+	0,					/* nb_add */
+	0,					/* nb_subtract */
+	0,					/* nb_multiply */
+	0,					/* nb_divide */
+	0,					/* nb_remainder */
+	0,					/* nb_divmod */
+	0,					/* nb_power */
+	0,					/* nb_negative */
+	0,					/* nb_positive */
+	0,					/* nb_absolute */
+	(inquiry)timetz_nonzero,		/* nb_nonzero */
+};
+
+statichere PyTypeObject PyDateTime_TimeTZType = {
+	PyObject_HEAD_INIT(NULL)
+	0,					/* ob_size */
+	"datetime.timetz",			/* tp_name */
+	sizeof(PyDateTime_TimeTZ),		/* tp_basicsize */
+	0,					/* tp_itemsize */
+	(destructor)timetz_dealloc,		/* tp_dealloc */
+	0,					/* tp_print */
+	0,					/* tp_getattr */
+	0,					/* tp_setattr */
+	0,					/* tp_compare */
+	(reprfunc)timetz_repr,			/* tp_repr */
+	&timetz_as_number,			/* tp_as_number */
+	0,					/* tp_as_sequence */
+	0,					/* tp_as_mapping */
+	0,					/* tp_hash */
+	0,              			/* tp_call */
+	0,					/* tp_str */
+	PyObject_GenericGetAttr,		/* tp_getattro */
+	0,					/* tp_setattro */
+	0,					/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES |
+        Py_TPFLAGS_BASETYPE,			/* tp_flags */
+	time_doc,				/* tp_doc */
+	0,					/* tp_traverse */
+	0,					/* tp_clear */
+	0,					/* tp_richcompare */
+	0,					/* tp_weaklistoffset */
+	0,					/* tp_iter */
+	0,					/* tp_iternext */
+	timetz_methods,				/* tp_methods */
+	0,					/* tp_members */
+	timetz_getset,				/* tp_getset */
+	&PyDateTime_TimeType,			/* tp_base */
+	0,					/* tp_dict */
+	0,					/* tp_descr_get */
+	0,					/* tp_descr_set */
+	0,					/* tp_dictoffset */
+	0,					/* tp_init */
+	0,					/* tp_alloc */
+	timetz_new,				/* tp_new */
+	_PyObject_Del,				/* tp_free */
+};
+
+/*
+ * PyDateTime_DateTimeTZ implementation.
+ */
+
+/* Accessor properties.  Properties for day, month, year, hour, minute,
+ * second and microsecond are inherited from datetime.
+ */
+
+static PyObject *
+datetimetz_tzinfo(PyDateTime_DateTimeTZ *self, void *unused)
+{
+	Py_INCREF(self->tzinfo);
+	return self->tzinfo;
+}
+
+static PyGetSetDef datetimetz_getset[] = {
+	{"tzinfo", (getter)datetimetz_tzinfo},
+	{NULL}
+};
+
+/*
+ * Constructors.
+ * These are like the datetime methods of the same names, but allow an
+ * optional tzinfo argument.
+ */
+
+/* Internal helper.
+ * self is a datetimetz.  Replace its tzinfo member.
+ */
+void
+replace_tzinfo(PyObject *self, PyObject *newtzinfo)
+{
+	assert(self != NULL);
+	assert(newtzinfo != NULL);
+	assert(PyDateTimeTZ_Check(self));
+	Py_INCREF(newtzinfo);
+	Py_DECREF(((PyDateTime_DateTimeTZ *)self)->tzinfo);
+	((PyDateTime_DateTimeTZ *)self)->tzinfo = newtzinfo;
+}
+
+static PyObject *
+datetimetz_new(PyTypeObject *type, PyObject *args, PyObject *kw)
+{
+	PyObject *self = NULL;
+	int year;
+	int month;
+	int day;
+	int hour = 0;
+	int minute = 0;
+	int second = 0;
+	int usecond = 0;
+	PyObject *tzinfo = Py_None;
+
+	static char *keywords[] = {
+		"year", "month", "day", "hour", "minute", "second",
+		"microsecond", "tzinfo", NULL
+	};
+
+	if (PyArg_ParseTupleAndKeywords(args, kw, "iii|iiiiO", keywords,
+					&year, &month, &day, &hour, &minute,
+					&second, &usecond, &tzinfo)) {
+		if (check_date_args(year, month, day) < 0)
+			return NULL;
+		if (check_time_args(hour, minute, second, usecond) < 0)
+			return NULL;
+		if (check_tzinfo_subclass(tzinfo) < 0)
+			return NULL;
+		self = new_datetimetz(year, month, day,
+				      hour, minute, second, usecond,
+				      tzinfo);
+	}
+	return self;
+}
+
+/* Return best possible local time -- this isn't constrained by the
+ * precision of a timestamp.
+ */
+static PyObject *
+datetimetz_now(PyObject *cls, PyObject *args, PyObject *kw)
+{
+	PyObject *self = NULL;
+	PyObject *tzinfo = Py_None;
+	static char *keywords[] = {"tzinfo", NULL};
+
+	if (PyArg_ParseTupleAndKeywords(args, kw, "|O:now", keywords,
+					&tzinfo)) {
+		if (check_tzinfo_subclass(tzinfo) < 0)
+			return NULL;
+		self = datetime_best_possible(cls, localtime);
+		if (self != NULL)
+			replace_tzinfo(self, tzinfo);
+	}
+	return self;
+}
+
+/* Return new local datetime from timestamp (Python timestamp -- a double). */
+static PyObject *
+datetimetz_fromtimestamp(PyObject *cls, PyObject *args, PyObject *kw)
+{
+	PyObject *self = NULL;
+	double timestamp;
+	PyObject *tzinfo = Py_None;
+	static char *keywords[] = {"timestamp", "tzinfo", NULL};
+
+	if (PyArg_ParseTupleAndKeywords(args, kw, "d|O:fromtimestamp",
+					keywords, &timestamp, &tzinfo)) {
+		if (check_tzinfo_subclass(tzinfo) < 0)
+			return NULL;
+		self = datetime_from_timestamp(cls, localtime, timestamp);
+		if (self != NULL)
+			replace_tzinfo(self, tzinfo);
+	}
+	return self;
+}
+
+/* Note:  utcnow() is inherited, and doesn't accept tzinfo.
+ * Ditto utcfromtimestamp().  Ditto combine().
+ */
+
+
+/*
+ * Destructor.
+ */
+
+static void
+datetimetz_dealloc(PyDateTime_DateTimeTZ *self)
+{
+	Py_XDECREF(self->tzinfo);
+	self->ob_type->tp_free((PyObject *)self);
+}
+
+/*
+ * Indirect access to tzinfo methods.
+ */
+
+/* Internal helper.
+ * Call a tzinfo object's method, or return None if tzinfo is None.
+ */
+static PyObject *
+datetimetz_convienience(PyDateTime_DateTimeTZ *self, char *name)
+{
+	PyObject *result;
+
+	if (self->tzinfo == Py_None) {
+		result = Py_None;
+		Py_INCREF(result);
+	}
+	else
+		result = PyObject_CallMethod(self->tzinfo, name, "O", self);
+	return result;
+}
+
+/* These are all METH_NOARGS, so don't need to check the arglist. */
+static PyObject *
+datetimetz_utcoffset(PyDateTime_DateTimeTZ *self, PyObject *unused) {
+	return datetimetz_convienience(self, "utcoffset");
+}
+
+static PyObject *
+datetimetz_tzname(PyDateTime_DateTimeTZ *self, PyObject *unused) {
+	return datetimetz_convienience(self, "tzname");
+}
+
+static PyObject *
+datetimetz_dst(PyDateTime_DateTimeTZ *self, PyObject *unused) {
+	return datetimetz_convienience(self, "dst");
+}
+
+/*
+ * datetimetz arithmetic.
+ */
+
+/* If base is Py_NotImplemented or NULL, just return it.
+ * Else base is a datetime, exactly one of {left, right} is a datetimetz,
+ * and we want to create a datetimetz with the same date and time fields
+ * as base, and with the tzinfo field from left or right.  Do that,
+ * return it, and decref base.  This is used to transform the result of
+ * a binary datetime operation (base) into a datetimetz result.
+ */
+static PyObject *
+attach_tzinfo(PyObject *base, PyObject *left, PyObject *right)
+{
+	PyDateTime_DateTimeTZ *self;
+	PyDateTime_DateTimeTZ *result;
+
+	if (base == NULL || base == Py_NotImplemented)
+		return base;
+
+	assert(PyDateTime_CheckExact(base));
+
+	if (PyDateTimeTZ_Check(left)) {
+		assert(! PyDateTimeTZ_Check(right));
+		self = (PyDateTime_DateTimeTZ *)left;
+	}
+	else {
+		assert(PyDateTimeTZ_Check(right));
+		self = (PyDateTime_DateTimeTZ *)right;
+	}
+	result = PyObject_New(PyDateTime_DateTimeTZ,
+			      &PyDateTime_DateTimeTZType);
+	if (result != NULL) {
+		memcpy(result->data, ((PyDateTime_DateTime *)base)->data,
+		       _PyDateTime_DATETIME_DATASIZE);
+		Py_INCREF(self->tzinfo);
+		result->tzinfo = self->tzinfo;
+	}
+	Py_DECREF(base);
+	return (PyObject *)result;
+}
+
+static PyObject *
+datetimetz_add(PyObject *left, PyObject *right)
+{
+	return attach_tzinfo(datetime_add(left, right), left, right);
+}
+
+static PyObject *
+datetimetz_subtract(PyObject *left, PyObject *right)
+{
+	PyObject *result = Py_NotImplemented;
+
+	if (PyDateTime_Check(left)) {
+		/* datetime - ??? */
+		if (PyDateTime_Check(right)) {
+			/* datetime - datetime */
+			naivety n1, n2;
+			int offset1, offset2;
+			PyDateTime_Delta *delta;
+
+			n1 = classify_object(left, &offset1);
+			assert(n1 != OFFSET_UNKNOWN);
+			if (n1 == OFFSET_ERROR)
+				return NULL;
+
+			n2 = classify_object(right, &offset2);
+			assert(n2 != OFFSET_UNKNOWN);
+			if (n2 == OFFSET_ERROR)
+				return NULL;
+
+			if (n1 != n2) {
+				PyErr_SetString(PyExc_TypeError,
+					"can't subtract offset-naive and "
+					"offset-aware datetimes");
+				return NULL;
+			}
+			delta = (PyDateTime_Delta *)sub_datetime_datetime(
+						(PyDateTime_DateTime *)left,
+						(PyDateTime_DateTime *)right);
+			if (delta == NULL || offset1 == offset2)
+				return (PyObject *)delta;
+			/* (left - offset1) - (right - offset2) =
+			 * (left - right) + (offset2 - offset1)
+			 */
+			result = new_delta(delta->days,
+					   delta->seconds +
+					   	(offset2 - offset1) * 60,
+					   delta->microseconds,
+					   1);
+			Py_DECREF(delta);
+		}
+		else if (PyDelta_Check(right)) {
+			/* datetimetz - delta */
+			result = sub_datetime_timedelta(
+					(PyDateTime_DateTime *)left,
+					(PyDateTime_Delta *)right);
+			result = attach_tzinfo(result, left, right);
+		}
+	}
+
+	if (result == Py_NotImplemented)
+		Py_INCREF(result);
+	return result;
+}
+
+/* Various ways to turn a datetime into a string. */
+
+static PyObject *
+datetimetz_repr(PyDateTime_DateTimeTZ *self)
+{
+	PyObject *baserepr = datetime_repr((PyDateTime_DateTime *)self);
+
+	if (baserepr == NULL)
+		return NULL;
+	return append_keyword_tzinfo(baserepr, self->tzinfo);
+}
+
+/* Note:  tp_str is inherited from datetime. */
+
+static PyObject *
+datetimetz_isoformat(PyDateTime_DateTimeTZ *self,
+		     PyObject *args, PyObject *kw)
+{
+	char buf[100];
+	PyObject *result = datetime_isoformat((PyDateTime_DateTime *)self,
+					      args, kw);
+
+	if (result == NULL || self->tzinfo == Py_None)
+		return result;
+
+	/* We need to append the UTC offset. */
+	if (format_utcoffset(buf, sizeof(buf), ":", self->tzinfo,
+			     (PyObject *)self) < 0) {
+		Py_DECREF(result);
+		return NULL;
+	}
+	PyString_ConcatAndDel(&result, PyString_FromString(buf));
+	return result;
+}
+
+/* Miscellaneous methods. */
+
+/* Note:  tp_richcompare and tp_hash are inherited from datetime. */
+
+static PyObject *
+datetimetz_timetuple(PyDateTime_DateTimeTZ *self)
+{
+	int dstflag = -1;
+
+	if (self->tzinfo != Py_None) {
+		int none;
+
+		dstflag = call_dst(self->tzinfo, (PyObject *)self, &none);
+		if (dstflag == -1 && PyErr_Occurred())
+			return NULL;
+
+		if (none)
+			dstflag = -1;
+		else if (dstflag != 0)
+			dstflag = 1;
+
+	}
+	return build_struct_time(GET_YEAR(self),
+				 GET_MONTH(self),
+				 GET_DAY(self),
+				 DATE_GET_HOUR(self),
+				 DATE_GET_MINUTE(self),
+				 DATE_GET_SECOND(self),
+				 dstflag);
+}
+
+static PyObject *
+datetimetz_utctimetuple(PyDateTime_DateTimeTZ *self)
+{
+	int y = GET_YEAR(self);
+	int m = GET_MONTH(self);
+	int d = GET_DAY(self);
+	int hh = DATE_GET_HOUR(self);
+	int mm = DATE_GET_MINUTE(self);
+	int ss = DATE_GET_SECOND(self);
+	int us = 0;	/* microseconds are ignored in a timetuple */
+	int offset = 0;
+
+	if (self->tzinfo != Py_None) {
+		int none;
+
+		offset = call_utcoffset(self->tzinfo, (PyObject *)self, &none);
+		if (offset == -1 && PyErr_Occurred())
+			return NULL;
+	}
+	/* Even if offset is 0, don't call timetuple() -- tm_isdst should be
+	 * 0 in a UTC timetuple regardless of what dst() says.
+	 */
+	if (offset) {
+		/* Subtract offset minutes & normalize. */
+		int stat;
+
+		mm -= offset;
+		stat = normalize_datetime(&y, &m, &d, &hh, &mm, &ss, &us);
+		if (stat < 0) {
+			/* At the edges, it's possible we overflowed
+			 * beyond MINYEAR or MAXYEAR.
+			 */
+			if (PyErr_ExceptionMatches(PyExc_OverflowError))
+				PyErr_Clear();
+			else
+				return NULL;
+		}
+	}
+	return build_struct_time(y, m, d, hh, mm, ss, 0);
+}
+
+static PyObject *
+datetimetz_gettimetz(PyDateTime_DateTimeTZ *self)
+{
+	return new_timetz(DATE_GET_HOUR(self),
+			  DATE_GET_MINUTE(self),
+			  DATE_GET_SECOND(self),
+			  DATE_GET_MICROSECOND(self),
+			  self->tzinfo);
+}
+
+/*
+ * Pickle support.  Quite a maze!
+ */
+
+/* Let basestate be the state string returned by datetime_getstate.
+ * If tzinfo is None, this returns (basestate,), else (basestate, tzinfo).
+ * So it's a tuple in any (non-error) case.
+ */
+static PyObject *
+datetimetz_getstate(PyDateTime_DateTimeTZ *self)
+{
+	PyObject *basestate;
+	PyObject *result = NULL;
+
+	basestate = datetime_getstate((PyDateTime_DateTime *)self);
+	if (basestate != NULL) {
+		if (self->tzinfo == Py_None)
+			result = Py_BuildValue("(O)", basestate);
+		else
+			result = Py_BuildValue("OO", basestate, self->tzinfo);
+		Py_DECREF(basestate);
+	}
+	return result;
+}
+
+static PyObject *
+datetimetz_setstate(PyDateTime_DateTimeTZ *self, PyObject *state)
+{
+	PyObject *temp;
+	PyObject *basestate;
+	PyObject *tzinfo = Py_None;
+
+	if (! PyArg_ParseTuple(state, "O!|O:__setstate__",
+			       &PyString_Type, &basestate,
+			       &tzinfo))
+		return NULL;
+	temp = datetime_setstate((PyDateTime_DateTime *)self, basestate);
+	if (temp == NULL)
+		return NULL;
+	Py_DECREF(temp);
+
+	Py_INCREF(tzinfo);
+	Py_XDECREF(self->tzinfo);
+	self->tzinfo = tzinfo;
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+static PyObject *
+datetimetz_pickler(PyObject *module, PyDateTime_DateTimeTZ *datetimetz)
+{
+	PyObject *state;
+	PyObject *result = NULL;
+
+	if (! PyDateTimeTZ_CheckExact(datetimetz)) {
+		PyErr_Format(PyExc_TypeError,
+			     "bad type passed to datetimetz pickler: %s",
+			     datetimetz->ob_type->tp_name);
+		return NULL;
+	}
+	state = datetimetz_getstate(datetimetz);
+	if (state) {
+		result = Py_BuildValue("O(O)",
+				       datetimetz_unpickler_object,
+				       state);
+		Py_DECREF(state);
+	}
+	return result;
+}
+
+static PyObject *
+datetimetz_unpickler(PyObject *module, PyObject *arg)
+{
+	PyDateTime_DateTimeTZ *self;
+
+	self = PyObject_New(PyDateTime_DateTimeTZ, &PyDateTime_DateTimeTZType);
+	if (self != NULL) {
+		PyObject *res;
+
+		self->tzinfo = NULL;
+		res = datetimetz_setstate(self, arg);
+		if (res == NULL) {
+			Py_DECREF(self);
+			return NULL;
+		}
+		Py_DECREF(res);
+	}
+	return (PyObject *)self;
+}
+
+
+static PyMethodDef datetimetz_methods[] = {
+	/* Class methods: */
+	/* Inherited: combine(), utcnow(), utcfromtimestamp() */
+
+	{"now",         (PyCFunction)datetimetz_now,
+	 METH_KEYWORDS | METH_CLASS,
+	 PyDoc_STR("[tzinfo] -> new datetimetz with local day and time.")},
+
+	{"fromtimestamp", (PyCFunction)datetimetz_fromtimestamp,
+	 METH_KEYWORDS | METH_CLASS,
+	 PyDoc_STR("timestamp[, tzinfo] -> local time from POSIX timestamp.")},
+
+	/* Instance methods: */
+	/* Inherited:  date(), time(), ctime(). */
+	{"timetuple",   (PyCFunction)datetimetz_timetuple, METH_NOARGS,
+         PyDoc_STR("Return time tuple, compatible with time.localtime().")},
+
+	{"utctimetuple",   (PyCFunction)datetimetz_utctimetuple, METH_NOARGS,
+         PyDoc_STR("Return UTC time tuple, compatible with time.localtime().")},
+
+	{"timetz",   (PyCFunction)datetimetz_gettimetz, METH_NOARGS,
+         PyDoc_STR("Return timetz object with same hour, minute, second, "
+         	   "microsecond, and tzinfo.")},
+
+	{"isoformat",   (PyCFunction)datetimetz_isoformat, METH_KEYWORDS,
+	 PyDoc_STR("[sep] -> string in ISO 8601 format, "
+	 	   "YYYY-MM-DDTHH:MM:SS[.mmmmmm][+HH:MM].\n\n"
+	 	   "sep is used to separate the year from the time, and "
+	 	   "defaults to 'T'.")},
+
+	{"utcoffset",	(PyCFunction)datetimetz_utcoffset, METH_NOARGS,
+	 PyDoc_STR("Return self.tzinfo.utcoffset(self).")},
+
+	{"tzname",	(PyCFunction)datetimetz_tzname,	METH_NOARGS,
+	 PyDoc_STR("Return self.tzinfo.tzname(self).")},
+
+	{"dst",		(PyCFunction)datetimetz_dst, METH_NOARGS,
+	 PyDoc_STR("Return self.tzinfo.dst(self).")},
+
+	{"__setstate__", (PyCFunction)datetimetz_setstate, METH_O,
+	 PyDoc_STR("__setstate__(state)")},
+
+	{"__getstate__", (PyCFunction)datetimetz_getstate, METH_NOARGS,
+	 PyDoc_STR("__getstate__() -> state")},
+	{NULL,	NULL}
+};
+
+static char datetimetz_doc[] =
+PyDoc_STR("date/time type.");
+
+static PyNumberMethods datetimetz_as_number = {
+	datetimetz_add,				/* nb_add */
+	datetimetz_subtract,			/* nb_subtract */
+	0,					/* nb_multiply */
+	0,					/* nb_divide */
+	0,					/* nb_remainder */
+	0,					/* nb_divmod */
+	0,					/* nb_power */
+	0,					/* nb_negative */
+	0,					/* nb_positive */
+	0,					/* nb_absolute */
+	0,					/* nb_nonzero */
+};
+
+statichere PyTypeObject PyDateTime_DateTimeTZType = {
+	PyObject_HEAD_INIT(NULL)
+	0,					/* ob_size */
+	"datetime.datetimetz",			/* tp_name */
+	sizeof(PyDateTime_DateTimeTZ),		/* tp_basicsize */
+	0,					/* tp_itemsize */
+	(destructor)datetimetz_dealloc,		/* tp_dealloc */
+	0,					/* tp_print */
+	0,					/* tp_getattr */
+	0,					/* tp_setattr */
+	0,					/* tp_compare */
+	(reprfunc)datetimetz_repr,		/* tp_repr */
+	&datetimetz_as_number,			/* tp_as_number */
+	0,					/* tp_as_sequence */
+	0,					/* tp_as_mapping */
+	0,					/* tp_hash */
+	0,              			/* tp_call */
+	0,					/* tp_str */
+	PyObject_GenericGetAttr,		/* tp_getattro */
+	0,					/* tp_setattro */
+	0,					/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES |
+        Py_TPFLAGS_BASETYPE,			/* tp_flags */
+	datetimetz_doc,				/* tp_doc */
+	0,					/* tp_traverse */
+	0,					/* tp_clear */
+	0,					/* tp_richcompare */
+	0,					/* tp_weaklistoffset */
+	0,					/* tp_iter */
+	0,					/* tp_iternext */
+	datetimetz_methods,			/* tp_methods */
+	0,					/* tp_members */
+	datetimetz_getset,			/* tp_getset */
+	&PyDateTime_DateTimeType,		/* tp_base */
+	0,					/* tp_dict */
+	0,					/* tp_descr_get */
+	0,					/* tp_descr_set */
+	0,					/* tp_dictoffset */
+	0,					/* tp_init */
+	0,					/* tp_alloc */
+	datetimetz_new,				/* tp_new */
+	_PyObject_Del,				/* tp_free */
+};
+
+/* ---------------------------------------------------------------------------
+ * Module methods and initialization.
+ */
+
+static PyMethodDef module_methods[] = {
+	/* Private functions for pickling support, registered with the
+	 * copy_reg module by the module init function.
+	 */
+	{"_date_pickler",	(PyCFunction)date_pickler,	METH_O, NULL},
+	{"_date_unpickler",	(PyCFunction)date_unpickler, 	METH_O, NULL},
+	{"_datetime_pickler",	(PyCFunction)datetime_pickler,	METH_O, NULL},
+	{"_datetime_unpickler",	(PyCFunction)datetime_unpickler,METH_O, NULL},
+	{"_datetimetz_pickler",	(PyCFunction)datetimetz_pickler,METH_O, NULL},
+	{"_datetimetz_unpickler",(PyCFunction)datetimetz_unpickler,METH_O, NULL},
+	{"_time_pickler",	(PyCFunction)time_pickler,	METH_O, NULL},
+	{"_time_unpickler",	(PyCFunction)time_unpickler,	METH_O, NULL},
+	{"_timetz_pickler",	(PyCFunction)timetz_pickler,	METH_O, NULL},
+	{"_timetz_unpickler",	(PyCFunction)timetz_unpickler,	METH_O, NULL},
+	{"_tzinfo_pickler",	(PyCFunction)tzinfo_pickler,	METH_O, NULL},
+	{"_tzinfo_unpickler",	(PyCFunction)tzinfo_unpickler,	METH_NOARGS,
+	 NULL},
+	{NULL, NULL}
+};
+
+PyMODINIT_FUNC
+initdatetime(void)
+{
+	PyObject *m;	/* a module object */
+	PyObject *d;	/* its dict */
+	PyObject *x;
+
+	/* Types that use __reduce__ for pickling need to set the following
+	 * magical attr in the type dict, with a true value.
+	 */
+	PyObject *safepickle = PyString_FromString("__safe_for_unpickling__");
+	if (safepickle == NULL)
+		return;
+
+	m = Py_InitModule3("datetime", module_methods,
+			   "Fast implementation of the datetime type.");
+
+	if (PyType_Ready(&PyDateTime_DateType) < 0)
+		return;
+	if (PyType_Ready(&PyDateTime_DateTimeType) < 0)
+		return;
+	if (PyType_Ready(&PyDateTime_DeltaType) < 0)
+		return;
+	if (PyType_Ready(&PyDateTime_TimeType) < 0)
+		return;
+	if (PyType_Ready(&PyDateTime_TZInfoType) < 0)
+		return;
+	if (PyType_Ready(&PyDateTime_TimeTZType) < 0)
+		return;
+	if (PyType_Ready(&PyDateTime_DateTimeTZType) < 0)
+		return;
+
+	/* Pickling support, via registering functions with copy_reg. */
+	{
+		PyObject *pickler;
+		PyObject *copyreg = PyImport_ImportModule("copy_reg");
+
+		if (copyreg == NULL) return;
+
+		pickler = PyObject_GetAttrString(m, "_date_pickler");
+		if (pickler == NULL) return;
+		date_unpickler_object = PyObject_GetAttrString(m,
+						"_date_unpickler");
+		if (date_unpickler_object == NULL) return;
+	    	x = PyObject_CallMethod(copyreg, "pickle", "OOO",
+	    				&PyDateTime_DateType,
+	    				pickler,
+		                    	date_unpickler_object);
+		if (x == NULL) return;
+		Py_DECREF(x);
+		Py_DECREF(pickler);
+
+		pickler = PyObject_GetAttrString(m, "_datetime_pickler");
+		if (pickler == NULL) return;
+		datetime_unpickler_object = PyObject_GetAttrString(m,
+						"_datetime_unpickler");
+		if (datetime_unpickler_object == NULL) return;
+	    	x = PyObject_CallMethod(copyreg, "pickle", "OOO",
+	    				&PyDateTime_DateTimeType,
+	    				pickler,
+		                    	datetime_unpickler_object);
+		if (x == NULL) return;
+		Py_DECREF(x);
+		Py_DECREF(pickler);
+
+		pickler = PyObject_GetAttrString(m, "_time_pickler");
+		if (pickler == NULL) return;
+		time_unpickler_object = PyObject_GetAttrString(m,
+						"_time_unpickler");
+		if (time_unpickler_object == NULL) return;
+	    	x = PyObject_CallMethod(copyreg, "pickle", "OOO",
+	    				&PyDateTime_TimeType,
+	    				pickler,
+		                	time_unpickler_object);
+		if (x == NULL) return;
+		Py_DECREF(x);
+		Py_DECREF(pickler);
+
+		pickler = PyObject_GetAttrString(m, "_timetz_pickler");
+		if (pickler == NULL) return;
+		timetz_unpickler_object = PyObject_GetAttrString(m,
+						"_timetz_unpickler");
+		if (timetz_unpickler_object == NULL) return;
+	    	x = PyObject_CallMethod(copyreg, "pickle", "OOO",
+	    				&PyDateTime_TimeTZType,
+	    				pickler,
+		                	timetz_unpickler_object);
+		if (x == NULL) return;
+		Py_DECREF(x);
+		Py_DECREF(pickler);
+
+		pickler = PyObject_GetAttrString(m, "_tzinfo_pickler");
+		if (pickler == NULL) return;
+		tzinfo_unpickler_object = PyObject_GetAttrString(m,
+							"_tzinfo_unpickler");
+		if (tzinfo_unpickler_object == NULL) return;
+	    	x = PyObject_CallMethod(copyreg, "pickle", "OOO",
+	    				&PyDateTime_TZInfoType,
+	    				pickler,
+		        		tzinfo_unpickler_object);
+		if (x== NULL) return;
+		Py_DECREF(x);
+		Py_DECREF(pickler);
+
+		pickler = PyObject_GetAttrString(m, "_datetimetz_pickler");
+		if (pickler == NULL) return;
+		datetimetz_unpickler_object = PyObject_GetAttrString(m,
+						 "_datetimetz_unpickler");
+		if (datetimetz_unpickler_object == NULL) return;
+	    	x = PyObject_CallMethod(copyreg, "pickle", "OOO",
+	    				&PyDateTime_DateTimeTZType,
+	    				pickler,
+		                	datetimetz_unpickler_object);
+		if (x== NULL) return;
+		Py_DECREF(x);
+		Py_DECREF(pickler);
+
+		Py_DECREF(copyreg);
+	}
+
+	/* timedelta values */
+	d = PyDateTime_DeltaType.tp_dict;
+
+	if (PyDict_SetItem(d, safepickle, Py_True) < 0)
+		return;
+
+	x = new_delta(0, 0, 1, 0);
+	if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_delta(-MAX_DELTA_DAYS, 0, 0, 0);
+	if (x == NULL || PyDict_SetItemString(d, "min", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_delta(MAX_DELTA_DAYS, 24*3600-1, 1000000-1, 0);
+	if (x == NULL || PyDict_SetItemString(d, "max", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	/* date values */
+	d = PyDateTime_DateType.tp_dict;
+
+	x = new_date(1, 1, 1);
+	if (x == NULL || PyDict_SetItemString(d, "min", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_date(MAXYEAR, 12, 31);
+	if (x == NULL || PyDict_SetItemString(d, "max", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_delta(1, 0, 0, 0);
+	if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	/* datetime values */
+	d = PyDateTime_DateTimeType.tp_dict;
+
+	x = new_datetime(1, 1, 1, 0, 0, 0, 0);
+	if (x == NULL || PyDict_SetItemString(d, "min", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_datetime(MAXYEAR, 12, 31, 23, 59, 59, 999999);
+	if (x == NULL || PyDict_SetItemString(d, "max", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_delta(0, 0, 1, 0);
+	if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	/* time values */
+	d = PyDateTime_TimeType.tp_dict;
+
+	x = new_time(0, 0, 0, 0);
+	if (x == NULL || PyDict_SetItemString(d, "min", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_time(23, 59, 59, 999999);
+	if (x == NULL || PyDict_SetItemString(d, "max", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_delta(0, 0, 1, 0);
+	if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	/* timetz values */
+	d = PyDateTime_TimeTZType.tp_dict;
+
+	x = new_timetz(0, 0, 0, 0, Py_None);
+	if (x == NULL || PyDict_SetItemString(d, "min", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_timetz(23, 59, 59, 999999, Py_None);
+	if (x == NULL || PyDict_SetItemString(d, "max", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_delta(0, 0, 1, 0);
+	if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	/* datetimetz values */
+	d = PyDateTime_DateTimeTZType.tp_dict;
+
+	x = new_datetimetz(1, 1, 1, 0, 0, 0, 0, Py_None);
+	if (x == NULL || PyDict_SetItemString(d, "min", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_datetimetz(MAXYEAR, 12, 31, 23, 59, 59, 999999, Py_None);
+	if (x == NULL || PyDict_SetItemString(d, "max", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	x = new_delta(0, 0, 1, 0);
+	if (x == NULL || PyDict_SetItemString(d, "resolution", x) < 0)
+		return;
+	Py_DECREF(x);
+
+	Py_DECREF(safepickle);
+
+	/* module initialization */
+	PyModule_AddIntConstant(m, "MINYEAR", MINYEAR);
+	PyModule_AddIntConstant(m, "MAXYEAR", MAXYEAR);
+
+	Py_INCREF(&PyDateTime_DateType);
+	PyModule_AddObject(m, "date", (PyObject *) &PyDateTime_DateType);
+
+	Py_INCREF(&PyDateTime_DateTimeType);
+	PyModule_AddObject(m, "datetime",
+			   (PyObject *) &PyDateTime_DateTimeType);
+
+	Py_INCREF(&PyDateTime_DeltaType);
+	PyModule_AddObject(m, "timedelta", (PyObject *) &PyDateTime_DeltaType);
+
+	Py_INCREF(&PyDateTime_TimeType);
+	PyModule_AddObject(m, "time", (PyObject *) &PyDateTime_TimeType);
+
+	Py_INCREF(&PyDateTime_TZInfoType);
+	PyModule_AddObject(m, "tzinfo", (PyObject *) &PyDateTime_TZInfoType);
+
+	Py_INCREF(&PyDateTime_TimeTZType);
+	PyModule_AddObject(m, "timetz", (PyObject *) &PyDateTime_TimeTZType);
+
+	Py_INCREF(&PyDateTime_DateTimeTZType);
+	PyModule_AddObject(m, "datetimetz",
+			   (PyObject *)&PyDateTime_DateTimeTZType);
+
+	/* A 4-year cycle has an extra leap day over what we'd get from
+	 * pasting together 4 single years.
+	 */
+	assert(DI4Y == 4 * 365 + 1);
+	assert(DI4Y == days_before_year(4+1));
+
+	/* Similarly, a 400-year cycle has an extra leap day over what we'd
+	 * get from pasting together 4 100-year cycles.
+	 */
+	assert(DI400Y == 4 * DI100Y + 1);
+	assert(DI400Y == days_before_year(400+1));
+
+	/* OTOH, a 100-year cycle has one fewer leap day than we'd get from
+	 * pasting together 25 4-year cycles.
+	 */
+	assert(DI100Y == 25 * DI4Y - 1);
+	assert(DI100Y == days_before_year(100+1));
+
+	us_per_us = PyInt_FromLong(1);
+	us_per_ms = PyInt_FromLong(1000);
+	us_per_second = PyInt_FromLong(1000000);
+	us_per_minute = PyInt_FromLong(60000000);
+	seconds_per_day = PyInt_FromLong(24 * 3600);
+	if (us_per_us == NULL || us_per_ms == NULL || us_per_second == NULL ||
+	    us_per_minute == NULL || seconds_per_day == NULL)
+		return;
+
+	/* The rest are too big for 32-bit ints, but even
+	 * us_per_week fits in 40 bits, so doubles should be exact.
+	 */
+	us_per_hour = PyLong_FromDouble(3600000000.0);
+	us_per_day = PyLong_FromDouble(86400000000.0);
+	us_per_week = PyLong_FromDouble(604800000000.0);
+	if (us_per_hour == NULL || us_per_day == NULL || us_per_week == NULL)
+		return;
+}
diff --git a/PC/dllbase_nt.txt b/PC/dllbase_nt.txt
index 1a4e677..54b5db6 100644
--- a/PC/dllbase_nt.txt
+++ b/PC/dllbase_nt.txt
@@ -5,7 +5,7 @@
 fixups are very slow, and significant performance gains can be
 made by selecting a good base address.
 
-This document is to allocate base addresses to core Python 
+This document is to allocate base addresses to core Python
 and Python .PYD files, to give a better change of optimal performance.
 This base address is passed to the linker using the /BASE
 command line switch.
@@ -31,6 +31,7 @@
  - unicodedata               1D120000 - 1D160000
  - winsound                  1D160000 - 1D170000
  - bZ2                       1D170000 - 1D180000
+ - datetime                  1D180000 - 1D190000
 
 Other extension modules
  - win32api                  1e200000 - 1e220000
diff --git a/PCbuild/datetime.dsp b/PCbuild/datetime.dsp
new file mode 100644
index 0000000..be735ce
--- /dev/null
+++ b/PCbuild/datetime.dsp
@@ -0,0 +1,99 @@
+# Microsoft Developer Studio Project File - Name="datetime" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102
+
+CFG=datetime - Win32 Debug
+!MESSAGE This is not a valid makefile. To build this project using NMAKE,
+!MESSAGE use the Export Makefile command and run
+!MESSAGE 
+!MESSAGE NMAKE /f "datetime.mak".
+!MESSAGE 
+!MESSAGE You can specify a configuration when running NMAKE
+!MESSAGE by defining the macro CFG on the command line. For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "datetime.mak" CFG="datetime - Win32 Debug"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "datetime - Win32 Release" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "datetime - Win32 Debug" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName "datetime"
+# PROP Scc_LocalPath ".."
+CPP=cl.exe
+MTL=midl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "datetime - Win32 Release"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "."
+# PROP Intermediate_Dir "x86-temp-release\datetime"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+F90=df.exe
+# ADD BASE CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /FD /c
+# ADD CPP /nologo /MD /W3 /GX /Zi /O2 /I "..\Include" /I "..\PC" /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /YX /FD /c
+# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /o "NUL" /win32
+# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /o "NUL" /win32
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /machine:I386
+# ADD LINK32 user32.lib kernel32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib wsock32.lib /nologo /base:"0x1D180000" /subsystem:windows /dll /debug /machine:I386 /nodefaultlib:"libc" /out:"./datetime.pyd"
+# SUBTRACT LINK32 /pdb:none
+
+!ELSEIF  "$(CFG)" == "datetime - Win32 Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "."
+# PROP Intermediate_Dir "x86-temp-debug\datetime"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+F90=df.exe
+# ADD BASE CPP /nologo /MTd /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /YX /FD /c
+# ADD CPP /nologo /MDd /W3 /Gm /GX /Zi /Od /I "..\Include" /I "..\PC" /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /YX /FD /c
+# ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /o "NUL" /win32
+# ADD MTL /nologo /D "_DEBUG" /mktyplib203 /o "NUL" /win32
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 user32.lib kernel32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib wsock32.lib /nologo /base:"0x1D180000" /subsystem:windows /dll /debug /machine:I386 /nodefaultlib:"libc" /nodefaultlib:"msvcrt" /out:"./datetime_d.pyd" /pdbtype:sept
+# SUBTRACT LINK32 /pdb:none
+
+!ENDIF 
+
+# Begin Target
+
+# Name "datetime - Win32 Release"
+# Name "datetime - Win32 Debug"
+# Begin Source File
+
+SOURCE=..\Modules\datetimemodule.c
+# End Source File
+# End Target
+# End Project
diff --git a/PCbuild/pcbuild.dsw b/PCbuild/pcbuild.dsw
index b6d65c7..7e80aaa 100644
--- a/PCbuild/pcbuild.dsw
+++ b/PCbuild/pcbuild.dsw
@@ -129,6 +129,21 @@
 
 ###############################################################################
 
+Project: "datetime"=.\datetime.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+    Begin Project Dependency
+    Project_Dep_Name pythoncore
+    End Project Dependency
+}}}
+
+###############################################################################
+
 Project: "mmap"=.\mmap.dsp - Package Owner=<4>
 
 Package=<5>
diff --git a/PCbuild/python20.wse b/PCbuild/python20.wse
index 91ad583..239e6b7 100644
--- a/PCbuild/python20.wse
+++ b/PCbuild/python20.wse
@@ -1740,6 +1740,11 @@
   Flags=0000000000000010
 end
 item: Install File
+  Source=.\datetime.pyd
+  Destination=%MAINDIR%\DLLs\datetime.pyd
+  Flags=0000000000000010
+end
+item: Install File
   Source=.\mmap.pyd
   Destination=%MAINDIR%\DLLs\mmap.pyd
   Flags=0000000000000010
@@ -1827,6 +1832,11 @@
   Flags=0000000000000010
 end
 item: Install File
+  Source=.\datetime.lib
+  Destination=%MAINDIR%\libs\datetime.lib
+  Flags=0000000000000010
+end
+item: Install File
   Source=.\mmap.lib
   Destination=%MAINDIR%\libs\mmap.lib
   Flags=0000000000000010
diff --git a/PCbuild/readme.txt b/PCbuild/readme.txt
index f565c5a..b6cd15c 100644
--- a/PCbuild/readme.txt
+++ b/PCbuild/readme.txt
@@ -48,6 +48,8 @@
 _testcapi
     tests of the Python C API, run via Lib/test/test_capi.py, and
     implemented by module Modules/_testcapimodule.c
+datetime
+    datetimemodule.c
 mmap
     mmapmodule.c
 parser