SF patch 407758, "timemodule patches for Cygwin", from Norman Vine.
http://sourceforge.net/tracker/?func=detail&aid=407758&group_id=5470&atid=305470
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 90886f2..cfce06b 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -664,6 +664,13 @@
ins(d, "tzname", Py_BuildValue("(zz)", "", ""));
#endif /* macintosh */
#endif /* HAVE_TM_ZONE */
+#ifdef __CYGWIN__
+ tzset();
+ ins(d, "timezone", PyInt_FromLong(_timezone));
+ ins(d, "altzone", PyInt_FromLong(_timezone));
+ ins(d, "daylight", PyInt_FromLong(_daylight));
+ ins(d, "tzname", Py_BuildValue("(zz)", _tzname[0], _tzname[1]));
+#endif /* __CYGWIN__ */
#endif /* !HAVE_TZNAME || __GLIBC__ */
}