Hi, I compared Europe/Astrakhan, Europe/Ulyanovsk and https://ru.wikipedia.org/wiki/%D0%92%D1%80%D0%B5%D0%BC%D1%8F_%D0%B2_%D0%A0%D... , noticed some discrepancies and decided to look a bit closer. 1. Europe/Astrakhan, 1961 transition. That one appears to be void and looks like an artifact of Stalingrad -> Volgograd renaming. 2. Europe/Samara, KUYT in 1991. Europe/Samara currently has KUYT between 1991-09-29 and 1991-10-20. But the decree of the Presidium of the Supreme Council of the RSFSR about renaming Kuybyshev to Samara is dated 1991-01-25: http://pravo.gov.ru/proxy/ips/?docbody=&nd=102010448 I also wanted to check the date of the 1991-10-20 transition but did not found any sources. 3. Europe/Chisinau, 1990 transitions. While googling for Soviet era documents for Russian zones I found the act of the government of the Republic of Moldova Nr. 132 from 04.05.1990 http://lex.justice.md/index.php?action=view&view=doc&lang=2&id=298782 It says that since 1990-05-06 on the territory of the Moldavian SSR time would be calculated as the standard time of the second time belt plus one hour of the "summer" time. To implement that clocks would be adjusted one hour backwards at 1990-05-06 2:00. After that "summer" time would be cancelled last Sunday of September at 3:00 and reintroduced last Sunday of March at 2:00. I believe that means UTC+0400 -> UTC+0300 transition at 1990-05-06 02:00 and that UTC+0300 -> UTC+0200 transition on 1990-09-30 was expected, while current Europe/Chisinau says UTC+0300 -> UTC+0200 at 1990-05-06 00:00 and no transitions on 1990-03-25 and 1990-09-30. 4. Asia/Barnaul, 1995. Letter of Bank of Russia from 25.05.1995 http://www.bestpravo.ru/rossijskoje/lj-akty/y3a.htm suggests that Altai Republic transitioned to Moscow+3 on 1995-05-28. Currently Asia/Barnaul guesses it was on Moscow+3 since 1992-01-19. http://regnum.ru/news/society/1957270.html has some historical data for Altai Krai: before 1957: west part on UTC+6, east on UTC+7 after 1957: UTC+7 since 1995: UTC+6 http://barnaul.rusplt.ru/index/pochemu_altajskij_kraj_okazalsja_v_neprivychn... confirms that and provides more details including 1995-05-28 transition date. 5. Tomsk, 2002. http://pravo.gov.ru/proxy/ips/?docbody=&nd=102075743 transitions Tomsk to the time of the fifth time belt at 2002-05-01 03:00. Tomsk currently is listed under Asia/Novosibirsk with transition to Moscow+3 on 1993-05-23. 6. Europe/Astrakhan, Europe/Volgograd, 1991-1992 UTC+0400. Wikipedia provides different guess for these dates but explicitly says it's a guess. Are there any sources? 7. 1988 and 1989 changes. Wikipedia and other sources refer to the Act of the Council of Ministers of the USSR from 04.01.1988 No. 5 and the Act of the Council of Ministers of the USSR from 14.03.1989 No. 227 I did not found full texts of these acts. For the 1989 one we have title at http://base.garant.ru/70754136/ : "About change in calculation of time on the territories of Lithuanian SSR, Latvian SSR and Estonian SSR, Astrakhan, Kaliningrad, Kirov, Kuybyshev, Ulyanovsk and Uralsk oblasts". And http://astrozet.net/files/Zones/DOC/RU/1980-925.txt appears to contain quotes from both acts: Since last Sunday of March 1988 rules of the second time belt are installed in Volgograd and Saratov oblasts. Since last Sunday of March 1989: a) Lithuanian SSR, Latvian SSR, Estonian SSR, Kaliningrad oblast: second time belt rules without extra hour (Moscow-1); b) Astrakhan, Kirov, Kuybyshev, Ulyanovsk oblasts: second time belt rules (Moscow time) c) Uralsk oblast: third time belt rules (Moscow+1). Currently Europe/Riga, Europe/Tallinn, Europe/Astrakhan, Europe/Samara, Europe/Ulyanovsk and Asia/Oral agree with the acts; Europe/Volgograd, Europe/Vilnius and Europe/Kaliningrad disagree. The 1989 act is mentioned in the comments for Latvia. 8. Europe/Kaliningrad, 1989-1992. Contemporary article reproduced at http://www.rgo.ru/ru/kaliningradskoe-oblastnoe-otdelenie/ob-otdelenii/publik... confirms that the 1989 change to Moscow-1 was implemented. (The article, though, is misattributed to 1990 while saying that summer->winter transition would be done on the 24 of September. But 1990-09-24 was Monday, while 1989-09-24 was Sunday as expected.) 2014 article at http://www.kaliningradka.ru/site_pc/cherez/index.php?ELEMENT_ID=40091 says that Kaliningrad switched to Moscow-1 on 1989-03-26, avoided at the last moment switch to Moscow-1 on 1991-03-31, switched to Moscow on 1991-11-03, switched to Moscow-1 on 1992-01-19. Europe/Kaliningrad currently disagrees with this between 1989-03-26 and 1991-11-03. 9. Europe/Vilnius, 1989. Lithuania most probably did switch to Moscow-1 on 1989-03-26 but this is not reflected in Europe/Vilnius. 10. Europe/Volgograd, 1988-1989. Volgograd and Saratov supposedly switched to Moscow time on 1998-03-27. Kirov supposedly switched on 1989-03-26. Europe/Volgograd currently says switch happend on 1989-03-26. 11. Regions-violators, 1981-1982. Wikipedia refers to http://maps.monetonos.ru/maps/raznoe/Old_Maps/Old_Maps/Articles/022/3_1981.h... and http://besp.narod.ru/nauka_1981_3.htm . The second link provides two articles scanned from the Nauka i Zhizn magazine No. 3, 1981 and a scan of the short article attributed to the Trud newspaper from Feburary 1982. The first link provides the same Nauka i Zhizn articles converted to the text form (but misses time belt changes map). The second Nauka i Zhizn article says that in addition to introduction of summer time on 1981-04-01 there are some time belt border changes on 1981-10-01, mostly affecting Nenets Autonomous Okrug, Krasnoyarsk Krai, Yakutia, Magadan Oblast and Chukotka according to the provided map (colored one). In addition to that "time violators" (regions which were not using rules of the time belts in which they were located) would not be moving off the DST on 1981-10-01 to restore the decree time usage. (Komi ASSR was supposed to repeat that move in October 1982 to account for the 2 hour difference.) Map depicting "time violators" before 1981-10-01 is also provided. The article from Trud says that 1981-10-01 changes caused problems and some territories would be moved to pre-1981-10-01 time by not moving to summer time on 1982-04-01. Namely: Dagestan, Kabardino-Balkar, Kalmyk, Komi, Mari, Mordovian, North Ossetian, Tatar, Chechen-Ingush and Chuvash ASSR, Krasnodar and Stavropol krais, Arkhangelsk, Vladimir, Vologda, Voronezh, Gorky, Ivanovo, Kostroma, Lipetsk, Penza, Rostov, Ryazan, Tambov, Tyumen and Yaroslavl oblasts, Nenets and Evenk autonomous okrugs, Khatangsky district of Taymyr Autonomous Okrug. As a result Evenk Autonomous Okrug and Khatangsky district of Taymyr Autonomous Okrug would end up on Moscow+4, Tyumen Oblast on Moscow+2 and the rest on Moscow time. http://astrozet.net/files/Zones/DOC/RU/1980-925.txt attributes the 1982 changes to the Act of the Council of Ministers of the USSR No. 126 from 18.02.1982. 1980-925.txt also adds Udmurtia to the list of affected territories and lists Khatangsky district separately from Taymyr Autonomous Okurg. Probably erroneously. The affected territories are currently listed under Europe/Moscow, Asia/Yekaterinburg and Asia/Krasnoyarsk. 12. Udmurtia The fact that Udmurtia is depicted as a violator in the Nauka i Zhizn article hints at Izhevsk being on different time from Kuybyshev before 1981-10-01. Udmurtia is not mentioned in the 1989 act. http://astrozet.net/files/Zones/DOC/RU/1980-925.txt implies Udmurtia was on Moscow time after 1982-04-01. Wikipedia implies Udmurtia being on Moscow+1 until 1991.