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Wed Dec 12 02:11:20 CET 2012 · https://mail.python.org/pipermail/python-dev/2012-December/123107.html

Guido van Rossum wrote:
> Sent: Tuesday, December 11, 2012 4:11 PM
> To: Antoine Pitrou
> Cc: python-dev at python.org
> Subject: Re: [Python-Dev] Draft PEP for time zone support.
> 
> On Tue, Dec 11, 2012 at 8:07 AM, Antoine Pitrou <solipsis at pitrou.net>
> wrote:
> > Le Tue, 11 Dec 2012 16:23:37 +0100,
> > Lennart Regebro <regebro at gmail.com> a écrit :
> >>
> >> Changes in the ``datetime``-module
> >> --------------------------------------
> >>
> >> A new ``is_dst`` parameter is added to several of the `tzinfo`
> >> methods to handle time ambiguity during DST changeovers.
> >>
> >> * ``tzinfo.utcoffset(self, dt, is_dst=True)``
> >>
> >> * ``tzinfo.dst(self, dt, is_dst=True)``
> >>
> >> * ``tzinfo.tzname(self, dt, is_dst=True)``
> >>
> >> The ``is_dst`` parameter can be ``True`` (default), ``False``, or
> >> ``None``.
> >>
> >> ``True`` will specify that the given datetime should be interpreted
> >> as happening during daylight savings time, ie that the time
> specified
> >> is before the change from DST.
> >
> > Why is it True by default? Do we have statistics showing that Python
> > gets more use in summer?
> 
> My question exactly.

"Summer" in the USA, at least, is 238 days in 2012, while "Winter" into 2013 is only 126 days:

>>> import datetime
>>> datetime.date(2012, 11, 4) - datetime.date(2012, 3, 11)
datetime.timedelta(238)
>>> datetime.date(2013, 3, 10) - datetime.date(2012, 11, 4)
datetime.timedelta(126)


Robert Brewer
fumanchu at aminus.org

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[Python-Dev] Draft PEP for time zone support.