| """ | |
| babel.localtime._fallback | |
| ~~~~~~~~~~~~~~~~~~~~~~~~~ | |
| Emulated fallback local timezone when all else fails. | |
| :copyright: (c) 2013-2025 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 | |