Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!news1.tnib.de!feed.news.tnib.de!news.tnib.de!newsfeed.freenet.ag!news2.euro.net!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path: <python-python-list@m.gmane.org>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.001
X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; '*not*': 0.07; 'bug.': 0.09; 'issue:': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:while': 0.09; 'windows,': 0.09; 'python': 0.11; 'bug': 0.12; 'jan': 0.12; 'suggest': 0.14; 'windows': 0.15; '(now': 0.16; 'arg': 0.16; 'clock.': 0.16; 'displaying': 0.16; 'incorrect': 0.16; 'maintainer': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'reedy': 0.16; 'subject:changing': 0.16; 'summarize': 0.16; 'utc,': 0.16; 'thanks,': 0.17; 'wrote:': 0.18; 'app': 0.19; 'module': 0.19; 'passing': 0.19; "python's": 0.19; 'seems': 0.21; '>>>': 0.22; 'import': 0.22; 'issue.': 0.22; 'print': 0.22; 'header:User-Agent:1': 0.23; 'example.': 0.24; 'issue,': 0.24; 'module,': 0.24; 'tracker': 0.26; 'least': 0.26; 'header:X -Complaints-To:1': 0.27; 'header:In-Reply-To:1': 0.27; 'function': 0.29; 'am,': 0.29; 'compared': 0.30; 'said,': 0.30; '-0700,': 0.31; 'clock': 0.31; "d'aprano": 0.31; 'purely': 0.31; 'steven': 0.31; 'updated': 0.34; 'skip:d 20': 0.34; 'but': 0.35; 'really': 0.36; 'should': 0.36; 'wrong': 0.37; 'application': 0.37; 'so,': 0.37; 'whatever': 0.38; 'to:addr:python-list': 0.38; 'issue': 0.38; 'pm,': 0.38; 'that,': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'users': 0.40; 'skip:u 10': 0.60; 'easy': 0.60; 'manually': 0.60; 'received:173': 0.61; 'times': 0.62; 'believe': 0.68; 'eastern': 0.68; 'reads': 0.68; 'choose.': 0.84; 'earth.': 0.84; 'received:fios.verizon.net': 0.84; 'slowed': 0.84; 'traveling': 0.96; '2013': 0.98
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Terry Jan Reedy <tjreedy@udel.edu>
Subject: Re: Time zone changing while Win app is running
Date: Wed, 03 Apr 2013 17:41:43 -0400
References: <65e456f0-a59d-4461-9af9-d5bb1413d91f@p5g2000yqj.googlegroups.com> <515bdc3d$0$29891$c3e8da3$5496439d@news.astraweb.com> <57d569df-8d29-4941-945d-46e416fc7016@n2g2000yqg.googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Gmane-NNTP-Posting-Host: pool-173-75-251-66.phlapa.fios.verizon.net
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130307 Thunderbird/17.0.4
In-Reply-To: <57d569df-8d29-4941-945d-46e416fc7016@n2g2000yqg.googlegroups.com>
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list/>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.76.1365025321.3114.python-list@python.org>
Lines: 50
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1365025321 news.xs4all.nl 6873 [2001:888:2000:d::a6]:45134
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:42706

On 4/3/2013 2:46 PM, CM wrote:
> On Apr 3, 7:37 am, Steven D'Aprano <steve
> +comp.lang.pyt...@pearwood.info> wrote:
>> On Tue, 02 Apr 2013 17:04:12 -0700, CM wrote:
>>> To summarize the issue:  In an application, I have been using Python's
>>> datetime module to get the current time.  But it seems that, at least
>>> with Windows (XP), whatever time zone your computer is set to when you
>>> start the application, that's what datetime will use--the time zone will
>>> *not* be updated in the application when you update it manually with
>>> Windows.  So, if you change the time zone (say, after traveling with
>>> your laptop), all datetimes will be incorrect as compared to your system
>>> clock.
>>
>> I am not the maintainer of the datetime module, but based purely on what
>> you have said, I would consider that a bug.

I don't. Do you really want every time function slowed by 
re-initializing the timezone?

>> I suggest you report it as an issue on the Python bug tracker.

I do believe that time.tzget can now be make to work now on Windows, and 
that would be a proper tracker issue.
>
> Thanks, I submitted an issue about it.  On 2.7.3, on Windows, it's
> easy to demonstrate:
>
> (Actual time = 2:40pm; tz = Eastern U.S.)
>
>> import datetime
>> print datetime.datetime.now()
> 2013-04-03 14:40:03.124000     <---- RIGHT
>
> (Now change time zone to UTC, for example.  Now clock reads 6:41pm.)

>> import datetime

Without a restart, this is a no=op.

>> print datetime.datetime.now()
> 2013-04-03 14:41:13.124000     <---- WRONG

As I said on the issue, passing a tz arg to now() will give the answer 
for any timezone on earth. A user-friendly app displaying times should 
let users choose.

--
Terry Jan Reedy