45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
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"""
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babel.localtime._fallback
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~~~~~~~~~~~~~~~~~~~~~~~~~
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Emulated fallback local timezone when all else fails.
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:copyright: (c) 2013-2024 by the Babel Team.
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:license: BSD, see LICENSE for more details.
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"""
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import datetime
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import time
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STDOFFSET = datetime.timedelta(seconds=-time.timezone)
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DSTOFFSET = datetime.timedelta(seconds=-time.altzone) if time.daylight else STDOFFSET
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DSTDIFF = DSTOFFSET - STDOFFSET
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ZERO = datetime.timedelta(0)
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class _FallbackLocalTimezone(datetime.tzinfo):
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def utcoffset(self, dt: datetime.datetime) -> datetime.timedelta:
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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: datetime.datetime) -> datetime.timedelta:
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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: datetime.datetime) -> str:
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return time.tzname[self._isdst(dt)]
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def _isdst(self, dt: datetime.datetime) -> bool:
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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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