[tz] Ulyanovsk, Altai Krai and Altai republic on their way to change time zones
mj1856 at hotmail.com
Mon Feb 22 19:13:49 UTC 2016
Looks much better now, and thanks for the explanation.
> Subject: Re: [tz] Ulyanovsk, Altai Krai and Altai republic on their way to change time zones
> To: mj1856 at hotmail.com; tz at iana.org
> From: eggert at cs.ucla.edu
> Date: Mon, 22 Feb 2016 11:06:07 -0800
> On 02/22/2016 09:07 AM, Matt Johnson wrote:
> > it looks like both of the new zones also have differing history (other
> > than LMT) from the zones they were split from. Was this intentional?
> Yes, the pre-1991 data come from Shanks & Pottenger, which is cited
> earlier in the 'europe' file as being the default source for old data.
> Shanks is not a good source but is the best we have for old data, and it
> says the new zones differ before 1970. My guess is that Shanks tried to
> find the dates for when these locations changed hands during the Russian
> Civil War, and used them to guess time transitions. Quite a bit of
> guesswork there, but it's the best we've got.
> > Asia/Barnaul should be the same as Asia/Omsk before 2016, but looks
> > like they also deviate considerably before that. Looks like rule
> > Russia is on the wrong lines, Omsk has an extra 2011 entry that
> > Barnaul doesn't, and the offsets differ as well.
> Thanks for checking that. I attempted to glue together the Shanks data
> with our post-1991 information. We have gaps in our information about
> the 1990s, so I guessed the gaps. Now that you mention it, my guess was
> probably not the best, as it should have prioritized our post-2000 data
> (which is more reliable) over our pre-2000 data. Also, I should
> definitely document that it's a guess, just like our guess about Tomsk
> in 1993. Further proposed patch attached (I've installed this in the
> experimental github version).
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