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authorGeorg Brandl <georg@python.org>2007-08-15 14:27:07 (GMT)
committerGeorg Brandl <georg@python.org>2007-08-15 14:27:07 (GMT)
commit739c01d47b9118d04e5722333f0e6b4d0c8bdd9e (patch)
treef82b450d291927fc1758b96d981aa0610947b529 /Doc/lib/tzinfo-examples.py
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-rw-r--r--Doc/lib/tzinfo-examples.py139
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diff --git a/Doc/lib/tzinfo-examples.py b/Doc/lib/tzinfo-examples.py
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@@ -1,139 +0,0 @@
-from datetime import tzinfo, timedelta, datetime
-
-ZERO = timedelta(0)
-HOUR = timedelta(hours=1)
-
-# A UTC class.
-
-class UTC(tzinfo):
- """UTC"""
-
- def utcoffset(self, dt):
- return ZERO
-
- def tzname(self, dt):
- return "UTC"
-
- def dst(self, dt):
- return ZERO
-
-utc = UTC()
-
-# A class building tzinfo objects for fixed-offset time zones.
-# Note that FixedOffset(0, "UTC") is a different way to build a
-# UTC tzinfo object.
-
-class FixedOffset(tzinfo):
- """Fixed offset in minutes east from UTC."""
-
- def __init__(self, offset, name):
- self.__offset = timedelta(minutes = offset)
- self.__name = name
-
- def utcoffset(self, dt):
- return self.__offset
-
- def tzname(self, dt):
- return self.__name
-
- def dst(self, dt):
- return ZERO
-
-# A class capturing the platform's idea of local time.
-
-import time as _time
-
-STDOFFSET = timedelta(seconds = -_time.timezone)
-if _time.daylight:
- DSTOFFSET = timedelta(seconds = -_time.altzone)
-else:
- DSTOFFSET = STDOFFSET
-
-DSTDIFF = DSTOFFSET - STDOFFSET
-
-class LocalTimezone(tzinfo):
-
- def utcoffset(self, dt):
- if self._isdst(dt):
- return DSTOFFSET
- else:
- return STDOFFSET
-
- def dst(self, dt):
- if self._isdst(dt):
- return DSTDIFF
- else:
- return ZERO
-
- def tzname(self, dt):
- return _time.tzname[self._isdst(dt)]
-
- def _isdst(self, dt):
- tt = (dt.year, dt.month, dt.day,
- dt.hour, dt.minute, dt.second,
- dt.weekday(), 0, -1)
- stamp = _time.mktime(tt)
- tt = _time.localtime(stamp)
- return tt.tm_isdst > 0
-
-Local = LocalTimezone()
-
-
-# A complete implementation of current DST rules for major US time zones.
-
-def first_sunday_on_or_after(dt):
- days_to_go = 6 - dt.weekday()
- if days_to_go:
- dt += timedelta(days_to_go)
- return dt
-
-# In the US, DST starts at 2am (standard time) on the first Sunday in April.
-DSTSTART = datetime(1, 4, 1, 2)
-# and ends at 2am (DST time; 1am standard time) on the last Sunday of Oct.
-# which is the first Sunday on or after Oct 25.
-DSTEND = datetime(1, 10, 25, 1)
-
-class USTimeZone(tzinfo):
-
- def __init__(self, hours, reprname, stdname, dstname):
- self.stdoffset = timedelta(hours=hours)
- self.reprname = reprname
- self.stdname = stdname
- self.dstname = dstname
-
- def __repr__(self):
- return self.reprname
-
- def tzname(self, dt):
- if self.dst(dt):
- return self.dstname
- else:
- return self.stdname
-
- def utcoffset(self, dt):
- return self.stdoffset + self.dst(dt)
-
- def dst(self, dt):
- if dt is None or dt.tzinfo is None:
- # An exception may be sensible here, in one or both cases.
- # It depends on how you want to treat them. The default
- # fromutc() implementation (called by the default astimezone()
- # implementation) passes a datetime with dt.tzinfo is self.
- return ZERO
- assert dt.tzinfo is self
-
- # Find first Sunday in April & the last in October.
- start = first_sunday_on_or_after(DSTSTART.replace(year=dt.year))
- end = first_sunday_on_or_after(DSTEND.replace(year=dt.year))
-
- # Can't compare naive to aware objects, so strip the timezone from
- # dt first.
- if start <= dt.replace(tzinfo=None) < end:
- return HOUR
- else:
- return ZERO
-
-Eastern = USTimeZone(-5, "Eastern", "EST", "EDT")
-Central = USTimeZone(-6, "Central", "CST", "CDT")
-Mountain = USTimeZone(-7, "Mountain", "MST", "MDT")
-Pacific = USTimeZone(-8, "Pacific", "PST", "PDT")