Tomsk time zone history
The Tomsk zone has changed its standard time 6 times since 1970, tied for the most among the 11 zones on UTC+7 standard time. The latest change of standard time came on May 29, 2016, from UTC+6 to UTC+7. Daylight saving time was used in 30 years since 1970, last in 2010; under the current rules the clocks no longer change.
UTC+7
Standard time is UTC+7 all year under the current rules.
Summer time in 30 of 57 years since 1970
Before 1970
Standard time changes
| Date | Change | New standard time | Clock label |
|---|---|---|---|
| Before 1970 | |||
| December 22, 1919 | Local mean time (UTC+5:39:51) replaced | UTC+6 | numeric only |
| June 21, 1930 | Standard time forward 1 hour | UTC+7 | numeric only |
| Since 1970 | |||
| March 31, 1991 | Summer offset kept as standard time; clocks did not move | UTC+6 | numeric only |
| January 19, 1992 | Standard time forward 1 hour | UTC+7 | numeric only |
| May 1, 2002 | Standard time back 1 hour | UTC+6 | numeric only |
| March 27, 2011 | Standard time forward 1 hour | UTC+7 | numeric only |
| October 26, 2014 | Standard time back 1 hour | UTC+6 | numeric only |
| May 29, 2016 | Standard time forward 1 hour | UTC+7 | numeric only |
Daylight saving periods
Since 1970: the periods shared by 14 of 26 zones, listed on the Russia page.
Also on UTC+7
Novosibirsk (Russia), Novokuznetsk (Russia), Barnaul (Russia), Krasnoyarsk (Russia), Hovd (Mongolia), Thailand, Vietnam, Pontianak (Indonesia), Jakarta (Indonesia) and Davis Station (Antarctica).
Clocks next door since 1970
- Novosibirsk (207 km): same time except 3,321 days in 1993–2002 and 2016.
- Novokuznetsk (335 km): same time except 3,469 days in 2002–2010 and 2014–2016.
- Barnaul (357 km): same time except 2,593 days in 1995–2002 and 2016.
- Krasnoyarsk (489 km): same time except 5,142 days in 2002–2016.
- Omsk (742 km): usually 1 hour behind; different on 5,144 days in 1981–2016.
How it compares
On standard time, clocks in Tomsk run 1 hour 20 minutes ahead of local mean solar time.