Ulaanbaatar time zone history
Daylight saving time was used in 24 years since 1970, last in 2016; under the current rules the clocks no longer change. On standard time, clocks at Ulaanbaatar run 52 minutes ahead of local mean solar time, the third-largest gap of the 9 zones on UTC+8 standard time whose clocks run ahead of the sun.
UTC+8
Standard time is UTC+8 all year under the current rules.
Summer time in 24 of 57 years since 1970
Before 1970
Standard time changes
| Date | Change | New standard time | Clock label |
|---|---|---|---|
| Before 1970 | |||
| August 1, 1905 | Local mean time (UTC+7:07:32) replaced | UTC+7 | numeric only |
| Since 1970 | |||
| January 1, 1978 | Standard time forward 1 hour | UTC+8 | numeric only |
Daylight saving periods
| Years | Clocks go forward | Clocks go back | Shift and labels |
|---|---|---|---|
| 1983 | April 1 | October 1 | 1 hour |
| 1984 | April 1 | September 30 | 1 hour |
| 1985–1998 | last Sunday in March, 00:00 | last Sunday in September, 00:00 | 1 hour |
| 2001 | April 28 | September 29 | 1 hour |
| 2002–2006 | last Saturday in March, 02:00 | last Saturday in September, 02:00 | 1 hour |
| 2015–2016 | last Saturday in March, 02:00 | fourth Saturday in September, 00:00 | 1 hour |
Also on UTC+8
Irkutsk (Russia), Shanghai (China), Taiwan, Macau, Hong Kong, Philippines, Malaysia, Singapore, Makassar (Indonesia) and Perth (Australia) (nearest first; 1 more on the list of offsets).
Clocks next door since 1970
- Irkutsk (Russia) (517 km): same time except 6,856 days in 1970–1977, 1981, 1982 and 1984–2016.
- Chita (Russia) (657 km): usually 1 hour ahead; different on 7,190 days in 1970–1977 and 1981–2016.
- Hovd (1,132 km): usually 1 hour behind; different on 2 days in 1977, 1983–1998, 2001–2006, 2015 and 2016.
- Krasnoyarsk (Russia) (1,314 km): usually 1 hour behind; different on 6,858 days in 1970–1977 and 1981–2016.
- Novokuznetsk (Russia) (1,525 km): usually 1 hour behind; different on 5,479 days in 1970–1977, 1981–2011, 2015 and 2016.
How it compares
Clocks have been changed 49 times since 1970, the second-most of the 12 zones on UTC+8 standard time.
Ulaanbaatar kept local mean time (UTC+7:07:32) until 1905, the third-latest switch of the 11 zones on UTC+8 standard time with local mean time in the record.