diff options
| -rw-r--r-- | Doc/library/datetime.rst | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/Doc/library/datetime.rst b/Doc/library/datetime.rst index f7e8762..88fa01c 100644 --- a/Doc/library/datetime.rst +++ b/Doc/library/datetime.rst @@ -1127,14 +1127,14 @@ Using datetime with tzinfo: >>> from datetime import timedelta, datetime, tzinfo >>> class GMT1(tzinfo): - ... def __init__(self): # DST starts last Sunday in March + ... def utcoffset(self, dt): + ... return timedelta(hours=1) + self.dst(dt) + ... def dst(self, dt): + ... # DST starts last Sunday in March ... d = datetime(dt.year, 4, 1) # ends last Sunday in October ... self.dston = d - timedelta(days=d.weekday() + 1) ... d = datetime(dt.year, 11, 1) ... self.dstoff = d - timedelta(days=d.weekday() + 1) - ... def utcoffset(self, dt): - ... return timedelta(hours=1) + self.dst(dt) - ... def dst(self, dt): ... if self.dston <= dt.replace(tzinfo=None) < self.dstoff: ... return timedelta(hours=1) ... else: @@ -1143,16 +1143,15 @@ Using datetime with tzinfo: ... return "GMT +1" ... >>> class GMT2(tzinfo): - ... def __init__(self): + ... def utcoffset(self, dt): + ... return timedelta(hours=2) + self.dst(dt) + ... def dst(self, dt): ... d = datetime(dt.year, 4, 1) ... self.dston = d - timedelta(days=d.weekday() + 1) ... d = datetime(dt.year, 11, 1) ... self.dstoff = d - timedelta(days=d.weekday() + 1) - ... def utcoffset(self, dt): - ... return timedelta(hours=1) + self.dst(dt) - ... def dst(self, dt): ... if self.dston <= dt.replace(tzinfo=None) < self.dstoff: - ... return timedelta(hours=2) + ... return timedelta(hours=1) ... else: ... return timedelta(0) ... def tzname(self,dt): @@ -1545,7 +1544,7 @@ When DST starts (the "start" line), the local wall clock leaps from 1:59 to 3:00. A wall time of the form 2:MM doesn't really make sense on that day, so ``astimezone(Eastern)`` won't deliver a result with ``hour == 2`` on the day DST begins. In order for :meth:`astimezone` to make this guarantee, the -:meth:`rzinfo.dst` method must consider times in the "missing hour" (2:MM for +:meth:`tzinfo.dst` method must consider times in the "missing hour" (2:MM for Eastern) to be in daylight time. When DST ends (the "end" line), there's a potentially worse problem: there's an |