[tz] Ulyanovsk, Altai Krai and Altai republic on their way to change time zones

Matt Johnson 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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