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To: cygwin AT cygwin DOT com
From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Subject: Re: tzset error
Date: Sat, 6 Dec 2014 15:34:23 +0000 (UTC)
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References: <548197CF DOT 4000104 AT inbox DOT ru> <20141205135837 DOT GL3810 AT calimero DOT vinschen DOT de> <loom DOT 20141206T060822-129 AT post DOT gmane DOT org> <5482C66B DOT 6030409 AT inbox DOT ru>
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 <rl76 <at> inbox.ru> writes:

> 06.12.2014 8:27, Brian Inglis пишет:

>> Belarus Standard Time was dropped in Dec 2011 Win DST update and replaced by
>> Kaliningrad Standard time “(UTC+03:00) Kaliningrad, Minsk”, reverted in Aug
>> 2014 Russian time zone updates, which restored Belarus +3:00 Minsk and
>> readded Kaliningrad +2:00 (RTZ 1).
>> Check your local Windows TZ selector dropdown or the registry.
>> The changes already appeared in tz 2014f August release.
 
> http://support.microsoft.com/kb/2998527/en-us

So they missed the August update and didn't actually release the updates
until September! 

The Cygwin tz mapping appears to have three upstreams: tz which is updated
an average dozen times a year (monthly, but may be more frequent for late
breaking changes like Fiji), but only updated by Cygwin about annually in
arrears; Windows which is updated a few times a year, if a lot of licenced
users are affected, and the rest of the changes are addressed with manual TZ
workarounds; and CLDR, which appears to be updated annually in arrears. 

The Cygwin tz maintainer needs to track the tz updates and the Windows
updates, provide patches to keep the CLDR updated, if you depend on it, and
release updates to the tz package and the Windows mapping with every Windows
update. 



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