See datetime.tzinfo.dst The is_dst parameter may be used to remove ambiguity during DST transitions. >>> from pytz import timezone >>> tz = timezone('America/St_Johns') >>> normal = datetime(2009, 9, 1) >>> str(tz.dst(normal)) '1:00:00'
(self, dt, is_dst=None)
| 425 | return self._utcoffset |
| 426 | |
| 427 | def dst(self, dt, is_dst=None): |
| 428 | '''See datetime.tzinfo.dst |
| 429 | |
| 430 | The is_dst parameter may be used to remove ambiguity during DST |
| 431 | transitions. |
| 432 | |
| 433 | >>> from pytz import timezone |
| 434 | >>> tz = timezone('America/St_Johns') |
| 435 | |
| 436 | >>> normal = datetime(2009, 9, 1) |
| 437 | |
| 438 | >>> str(tz.dst(normal)) |
| 439 | '1:00:00' |
| 440 | >>> str(tz.dst(normal, is_dst=False)) |
| 441 | '1:00:00' |
| 442 | >>> str(tz.dst(normal, is_dst=True)) |
| 443 | '1:00:00' |
| 444 | |
| 445 | >>> ambiguous = datetime(2009, 10, 31, 23, 30) |
| 446 | |
| 447 | >>> str(tz.dst(ambiguous, is_dst=False)) |
| 448 | '0:00:00' |
| 449 | >>> str(tz.dst(ambiguous, is_dst=True)) |
| 450 | '1:00:00' |
| 451 | >>> try: |
| 452 | ... tz.dst(ambiguous) |
| 453 | ... except AmbiguousTimeError: |
| 454 | ... print('Ambiguous') |
| 455 | Ambiguous |
| 456 | |
| 457 | ''' |
| 458 | if dt is None: |
| 459 | return None |
| 460 | elif dt.tzinfo is not self: |
| 461 | dt = self.localize(dt, is_dst) |
| 462 | return dt.tzinfo._dst |
| 463 | else: |
| 464 | return self._dst |
| 465 | |
| 466 | def tzname(self, dt, is_dst=None): |
| 467 | '''See datetime.tzinfo.tzname |