diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index 122f6b5..06fe647 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -303,6 +303,8 @@
         self.assertEqual('UTC+09:30', timezone(9.5 * HOUR).tzname(None))
         self.assertEqual('UTC-00:01', timezone(timedelta(minutes=-1)).tzname(None))
         self.assertEqual('XYZ', timezone(-5 * HOUR, 'XYZ').tzname(None))
+        # bpo-34482: Check that surrogates are handled properly.
+        self.assertEqual('\ud800', timezone(ZERO, '\ud800').tzname(None))
 
         # Sub-minute offsets:
         self.assertEqual('UTC+01:06:40', timezone(timedelta(0, 4000)).tzname(None))
@@ -1308,6 +1310,12 @@
             except ValueError:
                 pass
 
+        # bpo-34482: Check that surrogates don't cause a crash.
+        try:
+            t.strftime('%y\ud800%m')
+        except UnicodeEncodeError:
+            pass
+
         #check that this standard extension works
         t.strftime("%f")
 
@@ -1747,6 +1755,9 @@
         self.assertEqual(t.isoformat('T'), "0001-02-03T04:05:01.000123")
         self.assertEqual(t.isoformat(' '), "0001-02-03 04:05:01.000123")
         self.assertEqual(t.isoformat('\x00'), "0001-02-03\x0004:05:01.000123")
+        # bpo-34482: Check that surrogates are handled properly.
+        self.assertEqual(t.isoformat('\ud800'),
+                         "0001-02-03\ud80004:05:01.000123")
         self.assertEqual(t.isoformat(timespec='hours'), "0001-02-03T04")
         self.assertEqual(t.isoformat(timespec='minutes'), "0001-02-03T04:05")
         self.assertEqual(t.isoformat(timespec='seconds'), "0001-02-03T04:05:01")
@@ -1755,6 +1766,8 @@
         self.assertEqual(t.isoformat(timespec='auto'), "0001-02-03T04:05:01.000123")
         self.assertEqual(t.isoformat(sep=' ', timespec='minutes'), "0001-02-03 04:05")
         self.assertRaises(ValueError, t.isoformat, timespec='foo')
+        # bpo-34482: Check that surrogates are handled properly.
+        self.assertRaises(ValueError, t.isoformat, timespec='\ud800')
         # str is ISO format with the separator forced to a blank.
         self.assertEqual(str(t), "0001-02-03 04:05:01.000123")
 
@@ -2286,6 +2299,19 @@
         self.assertIs(type(expected), self.theclass)
         self.assertIs(type(got), self.theclass)
 
+        # bpo-34482: Check that surrogates are handled properly.
+        inputs = [
+            ('2004-12-01\ud80013:02:47.197', '%Y-%m-%d\ud800%H:%M:%S.%f'),
+            ('2004\ud80012-01 13:02:47.197', '%Y\ud800%m-%d %H:%M:%S.%f'),
+            ('2004-12-01 13:02\ud80047.197', '%Y-%m-%d %H:%M\ud800%S.%f'),
+        ]
+        for string, format in inputs:
+            with self.subTest(string=string, format=format):
+                expected = _strptime._strptime_datetime(self.theclass, string,
+                                                        format)
+                got = self.theclass.strptime(string, format)
+                self.assertEqual(expected, got)
+
         strptime = self.theclass.strptime
         self.assertEqual(strptime("+0002", "%z").utcoffset(), 2 * MINUTE)
         self.assertEqual(strptime("-0002", "%z").utcoffset(), -2 * MINUTE)
@@ -2353,6 +2379,12 @@
             t = t.replace(tzinfo=tz)
             self.assertEqual(t.strftime("%z"), "-0200" + z)
 
+        # bpo-34482: Check that surrogates don't cause a crash.
+        try:
+            t.strftime('%y\ud800%m %H\ud800%M')
+        except UnicodeEncodeError:
+            pass
+
     def test_extract(self):
         dt = self.theclass(2002, 3, 4, 18, 45, 3, 1234)
         self.assertEqual(dt.date(), date(2002, 3, 4))
@@ -2878,6 +2910,8 @@
         self.assertEqual(t.isoformat(timespec='microseconds'), "12:34:56.123456")
         self.assertEqual(t.isoformat(timespec='auto'), "12:34:56.123456")
         self.assertRaises(ValueError, t.isoformat, timespec='monkey')
+        # bpo-34482: Check that surrogates are handled properly.
+        self.assertRaises(ValueError, t.isoformat, timespec='\ud800')
 
         t = self.theclass(hour=12, minute=34, second=56, microsecond=999500)
         self.assertEqual(t.isoformat(timespec='milliseconds'), "12:34:56.999")
@@ -2928,6 +2962,12 @@
         # A naive object replaces %z and %Z with empty strings.
         self.assertEqual(t.strftime("'%z' '%Z'"), "'' ''")
 
+        # bpo-34482: Check that surrogates don't cause a crash.
+        try:
+            t.strftime('%H\ud800%M')
+        except UnicodeEncodeError:
+            pass
+
     def test_format(self):
         t = self.theclass(1, 2, 3, 4)
         self.assertEqual(t.__format__(''), str(t))