History
Until 1991, Omsk Time was one of the two time zones used in Soviet Central Asia. In addition to Omsk Oblast in the Russian SFSR, it covered the eastern two thirds of Kazakh SSR, all of Kyrgyz and Tajik SSRs, and eastern Uzbek SSR. This included the city of Omsk and the capitals Alma-Ata, Frunze (Bishkek), Dushanbe and Tashkent.
For two years after the collapse of the Soviet Union, Omsk oblast remained the only region in Russia in this time zone. The newly independent Central Asian states ceased to observe daylight saving time, while Uzbekistan and Tajikistan in addition "moved west" by adjusting the clocks one hour back.
In 1990s-2010s, Russia experienced a countrywide wave of clock shifts towards Moscow. By 2010, all Western Siberia's Moscow+4 regions moved to Moscow+3, merging into Omsk Time.
In 2011, Russia moved to year-round daylight saving time. Instead of switching between UTC+6 in winter and UTC+7 in summer, Omsk time was permanently set to UTC+7.
| Date | region(s) | Type of change | IANA time zone (tzid) |
|---|---|---|---|
| Eastern 2/3 Kazakhstan | leave | Asia/Almaty | |
| East Uzbekistan | leave | Asia/Tashkent | |
| Kyrgyzstan | leave | Asia/Bishkek | |
| Tajikistan | leave | Asia/Dushanbe | |
| 1993-05-23 | Novosibirsk Oblast | join | Asia/Novosibirsk |
| 1995-05-28 | Altai Krai and Altai Republic | join | Asia/Omsk |
| 2002-05-01 | Tomsk Oblast | join | Asia/Novosibirsk |
| 2010-03-28 | Kemerovo Oblast | join | Asia/Novokuznetsk |
Read more about this topic: Omsk Time
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