82 lines
1.7 KiB
Python
82 lines
1.7 KiB
Python
# Retrieved from http://docs.python.org/2/library/datetime.html on 2013-05-24
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from datetime import tzinfo, timedelta, datetime
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ZERO = timedelta(0)
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HOUR = timedelta(hours=1)
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# A UTC class.
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class UTC(tzinfo):
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"""UTC"""
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def utcoffset(self, dt):
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return ZERO
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def tzname(self, dt):
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return "UTC"
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def dst(self, dt):
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return ZERO
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utc = UTC()
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# A class building tzinfo objects for fixed-offset time zones.
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# Note that FixedOffset(0, "UTC") is a different way to build a
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# UTC tzinfo object.
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class FixedOffset(tzinfo):
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"""Fixed offset in minutes east from UTC."""
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def __init__(self, offset, name):
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self.__offset = timedelta(minutes = offset)
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self.__name = name
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def utcoffset(self, dt):
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return self.__offset
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def tzname(self, dt):
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return self.__name
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def dst(self, dt):
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return ZERO
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# A class capturing the platform's idea of local time.
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import time as _time
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STDOFFSET = timedelta(seconds = -_time.timezone)
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if _time.daylight:
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DSTOFFSET = timedelta(seconds = -_time.altzone)
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else:
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DSTOFFSET = STDOFFSET
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DSTDIFF = DSTOFFSET - STDOFFSET
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class LocalTimezone(tzinfo):
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def utcoffset(self, dt):
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if self._isdst(dt):
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return DSTOFFSET
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else:
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return STDOFFSET
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def dst(self, dt):
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if self._isdst(dt):
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return DSTDIFF
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else:
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return ZERO
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def tzname(self, dt):
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return _time.tzname[self._isdst(dt)]
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def _isdst(self, dt):
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tt = (dt.year, dt.month, dt.day,
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dt.hour, dt.minute, dt.second,
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dt.weekday(), 0, 0)
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stamp = _time.mktime(tt)
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tt = _time.localtime(stamp)
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return tt.tm_isdst > 0
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Local = LocalTimezone()
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