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