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