Ust-Nera time zone history
The largest single move came on April 1, 1981, when clocks went forward 3 hours, from UTC+9 to UTC+12. The Ust-Nera zone has changed its standard time 6 times since 1970, the most of the 10 zones on UTC+10 standard time. The record holds 6 different UTC offsets, the most of the 10 zones on UTC+10 standard time.
UTC+10
Standard time is UTC+10 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 15, 1919 | Local mean time (UTC+9:32:54) replaced | UTC+8 | numeric only |
| June 21, 1930 | Standard time forward 1 hour | UTC+9 | numeric only |
| Since 1970 | |||
| April 1, 1981 | Standard time forward 2 hours | UTC+11 | numeric only |
| March 31, 1991 | Summer offset kept as standard time; clocks did not move | UTC+10 | numeric only |
| January 19, 1992 | Standard time forward 1 hour | UTC+11 | numeric only |
| March 27, 2011 | Standard time forward 1 hour | UTC+12 | numeric only |
| September 13, 2011 | Standard time back 1 hour | UTC+11 | numeric only |
| October 26, 2014 | Standard time back 1 hour | UTC+10 | numeric only |
Daylight saving periods
| Years | Clocks go forward | Clocks go back | Shift and labels |
|---|---|---|---|
| 1981 | not that year | October 1 | 1 hour |
| 1982–1983 | 1 April, 00:00 | 1 October, 00:00 | 1 hour |
| 1984 | April 1 | September 30 | 1 hour |
| 1985–1990 | last Sunday in March, 02:00 | last Sunday in September, 03:00 | 1 hour |
| 1991 | not that year | September 29 | 1 hour |
| 1992–1995 | last Sunday in March, 02:00 | fourth Sunday in September, 03:00 | 1 hour |
| 1996–2010 | last Sunday in March, 02:00 | last Sunday in October, 03:00 | 1 hour |
Also on UTC+10
Vladivostok (Russia), Guam, Port Moresby (Papua New Guinea), Lindeman (Australia), Brisbane (Australia), Sydney (Australia), Melbourne (Australia), Hobart (Australia) and Macquarie Island (Australia).
Clocks next door since 1970
- Khandyga (434 km): usually 1 hour behind; different on 12,416 days in 1970–2011 and 2014.
- Srednekolymsk (573 km): same time except 9,697 days in 1970–1981 and 2011–2026; 1 hour ahead today.
- Magadan (680 km): same time except 9,151 days in 1970–1981, 2011–2014 and 2016–2026; 1 hour ahead today.
- Yakutsk (733 km): usually 2 hours behind; different on 9,702 days in 1970–2026; 1 hour behind today.
- Kamchatka (1,552 km): usually 1 hour ahead; different on 9,094 days in 1970–2011 and 2014–2026; 2 hours ahead today.
How it compares
The latest change of standard time came on October 26, 2014, from UTC+11 to UTC+10.
Daylight saving time was used in 30 years since 1970, last in 2010; under the current rules the clocks no longer change.
Ust-Nera kept local mean time (UTC+9:32:54) until 1919, the second-latest switch of the 9 zones on UTC+10 standard time with local mean time in the record.
On standard time, clocks in Ust-Nera run 27 minutes ahead of local mean solar time.