| """ |
| 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 |
