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| KALT | Kaliningrad Time | UTC+2 | (MSK−1) | |
| MSK | Moscow Time | UTC+3 | (MSK±0) | |
| SAMT | Samara Time | UTC+4 | (MSK+1) | |
| YEKT | Yekaterinburg Time | UTC+5 | (MSK+2) | |
| OMST | Omsk Time | UTC+6 | (MSK+3) | |
| KRAT | Krasnoyarsk Time | UTC+7 | (MSK+4) | |
| IRKT | Irkutsk Time | UTC+8 | (MSK+5) | |
| YAKT | Yakutsk Time | UTC+9 | (MSK+6) | |
| VLAT | Vladivostok Time | UTC+10 | (MSK+7) | |
| MAGT | Magadan Time | UTC+11 | (MSK+8) | |
| PETT | Kamchatka Time | UTC+12 | (MSK+9) |
Omsk Time (OMST) is atime zone inRussia that is six hours ahead ofUTC (UTC+06:00), and 3 hours ahead ofMoscow Time (MSK). It is used inOmsk Oblast.[1]
Until 1991, Omsk Time was one of the two time zones used inSoviet Central Asia. In addition toOmsk Oblast in theRussian SFSR, it covered the eastern two thirds ofKazakh SSR, all ofKyrgyz andTajik SSRs, and easternUzbek SSR. This included the city ofOmsk and the capitalsAlma-Ata (Almaty),Frunze (Bishkek),Dushanbe andTashkent.
For two years after thecollapse of the Soviet Union, Omsk Oblast remained the only region in Russia in this time zone. The newly independent Central Asian states ceased to observedaylight saving time, whileUzbekistan andTajikistan in addition "moved west" by adjusting the clocks one hour back.
From the 1990s to the 2010s, Russia experienced a countrywide wave of clock shifts towards Moscow. By 2010, allWestern 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 betweenUTC+06:00 in winter andUTC+07:00 in summer, Omsk time was set toUTC+07:00 until 2014, when it was reset back toUTC+06:00 year-round, butKemerovo Oblast decided to stay inUTC+07:00 -Krasnoyarsk Time.
In 2016, Altai Krai, Altai Republic,[2] Tomsk Oblast,[3] and Novosibirsk Oblast[4] switched to Krasnoyarsk Time (UTC+07:00).
Omsk Oblast is now the only part of Russia which uses this time zone.
| Date | region(s) | Type of change | IANA time zone (tzid) |
|---|---|---|---|
| Eastern 2/3Kazakhstan | leave | Asia/Almaty | |
| EastUzbekistan | leave | Asia/Tashkent | |
| Tajikistan | leave | Asia/Dushanbe | |
| 1993-05-23 | Novosibirsk Oblast[5] | join | Asia/Novosibirsk |
| 1995-05-28 | Altai Krai andAltai Republic[6] | join | Asia/Novosibirsk |
| 2002-05-01 | Tomsk Oblast[7][8] | join | Asia/Novosibirsk |
| 2010-03-28 | Kemerovo Oblast[9][10] | join | Asia/Novosibirsk |
| 2014 | Kemerovo Oblast | leave | Asia/Krasnoyarsk |
| 2016-03-27 | Altai Krai and Altai Republic | leave | Asia/Krasnoyarsk |
| 2016-05-29 | Tomsk Oblast | leave | Asia/Krasnoyarsk |
| 2016-07-24 | Novosibirsk Oblast | leave | Asia/Krasnoyarsk |