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"""
babel.localtime._fallback
~~~~~~~~~~~~~~~~~~~~~~~~~
Emulated fallback local timezone when all else fails.
:copyright: (c) 2013-2023 by the Babel Team.
:license: BSD, see LICENSE for more details.
"""
import datetime
import time
STDOFFSET = datetime.timedelta(seconds=-time.timezone)
DSTOFFSET = datetime.timedelta(seconds=-time.altzone) if time.daylight else STDOFFSET
DSTDIFF = DSTOFFSET - STDOFFSET
ZERO = datetime.timedelta(0)
class _FallbackLocalTimezone(datetime.tzinfo):
def utcoffset(self, dt: datetime.datetime) -> datetime.timedelta:
if self._isdst(dt):
return DSTOFFSET
else:
return STDOFFSET
def dst(self, dt: datetime.datetime) -> datetime.timedelta:
if self._isdst(dt):
return DSTDIFF
else:
return ZERO
def tzname(self, dt: datetime.datetime) -> str:
return time.tzname[self._isdst(dt)]
def _isdst(self, dt: datetime.datetime) -> bool:
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
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