[Python-Dev] Draft PEP for time zone support. (original) (raw)

Robert Brewer fumanchu at aminus.org
Wed Dec 12 02:11:20 CET 2012

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 isdst parameter is added to several of the tzinfo >> methods to handle time ambiguity during DST changeovers. >> >> * tzinfo.utcoffset(self, dt, isdst=True) >> >> * tzinfo.dst(self, dt, isdst=True) >> >> * tzinfo.tzname(self, dt, isdst=True) >> >> The isdst 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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