45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
"""
|
|
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
|