--- /dev/null
+from datetime import tzinfo
+
+class UTC(tzinfo):
+ """UTC"""
+
+ def utcoffset(self, dt):
+ return 0
+
+ def tzname(self, dt):
+ return "UTC"
+
+ def dst(self, dt):
+ return 0
+
+class FixedOffset(tzinfo):
+ """Fixed offset in minutes east from UTC."""
+
+ def __init__(self, offset, name):
+ self.__offset = offset
+ self.__name = name
+
+ def utcoffset(self, dt):
+ return self.__offset
+
+ def tzname(self, dt):
+ return self.__name
+
+ def dst(self, dt):
+ # It depends on more than we know in an example.
+ return None # Indicate we don't know
+
+import time
+
+class LocalTime(tzinfo):
+ """Local time as defined by the operating system."""
+
+ def _isdst(self, dt):
+ t = (dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second,
+ -1, -1, -1)
+ # XXX This may fail for years < 1970 or >= 2038
+ t = time.localtime(time.mktime(t))
+ return t.tm_isdst > 0
+
+ def utcoffset(self, dt):
+ if self._isdst(dt):
+ return -time.timezone/60
+ else:
+ return -time.altzone/60
+
+ def tzname(self, dt):
+ return time.tzname[self._isdst(dt)]