Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!nntp.club.cc.cmu.edu!micro-heart-of-gold.mit.edu!bloom-beacon.mit.edu!bloom-beacon.mit.edu!panix!not-for-mail From: Grant Edwards Newsgroups: comp.lang.python Subject: Re: How to look up historical time zones by date and location Date: Mon, 18 Aug 2014 21:14:03 +0000 (UTC) Organization: PANIX Public Access Internet and UNIX, NYC Lines: 14 Message-ID: References: <53F14971.3010209@gmail.com> <85mwb24h9o.fsf@benfinney.id.au> <53F1875F.4020109@gmail.com> <53F1FBCC.6060406@gmail.com> NNTP-Posting-Host: c-24-118-110-103.hsd1.mn.comcast.net X-Trace: reader1.panix.com 1408396443 26117 24.118.110.103 (18 Aug 2014 21:14:03 GMT) X-Complaints-To: abuse@panix.com NNTP-Posting-Date: Mon, 18 Aug 2014 21:14:03 +0000 (UTC) User-Agent: slrn/1.0.1 (Linux) Xref: csiph.com comp.lang.python:76515 On 2014-08-18, Ian Kelly wrote: > By working with dates far enough in the past that the modern time zone > rules don't apply. Some experimentation determines that the timedelta > between Shanghai and Urumqi goes from 136 minutes to 120 minutes in > 1928, and then from 120 minutes to 0 minutes in 1980. Thanks to politicians who keep mucking about with such things as a way to appear busy while still avoiding doing anything useful, it's no small feat to handle current timezones correctly. Expecting them to work for dates/times from long ago is pretty much beyond the pale. -- Grant