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77 lines
1.7 KiB
Python
77 lines
1.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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babel.localtime
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~~~~~~~~~~~~~~~
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Babel specific fork of tzlocal to determine the local timezone
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of the system.
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:copyright: (c) 2013 by the Babel Team.
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:license: BSD, see LICENSE for more details.
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"""
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import sys
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import pytz
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import time
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from datetime import timedelta, datetime
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from datetime import tzinfo
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from threading import RLock
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if sys.platform == 'win32':
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from babel.localtime._win32 import _get_localzone
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else:
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from babel.localtime._unix import _get_localzone
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_cached_tz = None
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_cache_lock = RLock()
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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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ZERO = timedelta(0)
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class _FallbackLocalTimezone(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, -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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def get_localzone():
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"""Returns the current underlying local timezone object.
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Generally this function does not need to be used, it's a
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better idea to use the :data:`LOCALTZ` singleton instead.
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"""
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return _get_localzone()
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try:
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LOCALTZ = get_localzone()
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except pytz.UnknownTimeZoneError:
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LOCALTZ = _FallbackLocalTimezone()
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