70 lines
2.0 KiB
Python
70 lines
2.0 KiB
Python
"Implementation of tzinfo classes for use with datetime.datetime."
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import locale
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import time
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from datetime import timedelta, tzinfo
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from django.utils.encoding import smart_unicode
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try:
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DEFAULT_ENCODING = locale.getdefaultlocale()[1] or 'ascii'
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except:
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# Any problems at all determining the locale and we fallback. See #5846.
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DEFAULT_ENCODING = 'ascii'
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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):
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self.__offset = timedelta(minutes=offset)
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self.__name = u"%+03d%02d" % (offset // 60, offset % 60)
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def __repr__(self):
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return self.__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 timedelta(0)
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class LocalTimezone(tzinfo):
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"Proxy timezone information from time module."
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def __init__(self, dt):
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tzinfo.__init__(self, dt)
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self._tzname = self.tzname(dt)
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def __repr__(self):
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return self._tzname
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def utcoffset(self, dt):
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if self._isdst(dt):
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return timedelta(seconds=-time.altzone)
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else:
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return timedelta(seconds=-time.timezone)
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def dst(self, dt):
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if self._isdst(dt):
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return timedelta(seconds=-time.altzone) - timedelta(seconds=-time.timezone)
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else:
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return timedelta(0)
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def tzname(self, dt):
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try:
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return smart_unicode(time.tzname[self._isdst(dt)], DEFAULT_ENCODING)
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except UnicodeDecodeError:
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return None
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def _isdst(self, dt):
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tt = (dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second, dt.weekday(), 0, -1)
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try:
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stamp = time.mktime(tt)
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except OverflowError:
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# 32 bit systems can't handle dates after Jan 2038, so we fake it
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# in that case (since we only care about the DST flag here).
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tt = (2037,) + tt[1:]
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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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