Asia/Ulan_Bator

Time zone identifier: Asia/Ulan_Bator

Current civil offset: +08:00 (+08)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1905-07-31

Local Mean Time (LMT): +07:07:32 based on geographic meridian

Total recorded transitions: 50 transitions across 4 distinct offsets

Historical Offset Step Chart (1880 to Present)

Text summary: Asia/Ulan_Bator shifted between 4 distinct offsets from 1905-07-31 through the modern era.

Complete Transition History (50 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1905-07-31T16:52:28Z`	`1905-07-31 23:52:28`	+07:07:32 → +07:00	`+07`	No	overlap
`1977-12-31T17:00:00Z`	`1978-01-01 01:00:00`	+07:00 → +08:00	`+08`	No	gap
`1983-03-31T16:00:00Z`	`1983-04-01 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1983-09-30T15:00:00Z`	`1983-09-30 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1984-03-31T16:00:00Z`	`1984-04-01 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1984-09-29T15:00:00Z`	`1984-09-29 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1985-03-30T16:00:00Z`	`1985-03-31 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1985-09-28T15:00:00Z`	`1985-09-28 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1986-03-29T16:00:00Z`	`1986-03-30 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1986-09-27T15:00:00Z`	`1986-09-27 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1987-03-28T16:00:00Z`	`1987-03-29 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1987-09-26T15:00:00Z`	`1987-09-26 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1988-03-26T16:00:00Z`	`1988-03-27 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1988-09-24T15:00:00Z`	`1988-09-24 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1989-03-25T16:00:00Z`	`1989-03-26 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1989-09-23T15:00:00Z`	`1989-09-23 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1990-03-24T16:00:00Z`	`1990-03-25 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1990-09-29T15:00:00Z`	`1990-09-29 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1991-03-30T16:00:00Z`	`1991-03-31 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1991-09-28T15:00:00Z`	`1991-09-28 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1992-03-28T16:00:00Z`	`1992-03-29 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1992-09-26T15:00:00Z`	`1992-09-26 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1993-03-27T16:00:00Z`	`1993-03-28 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1993-09-25T15:00:00Z`	`1993-09-25 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1994-03-26T16:00:00Z`	`1994-03-27 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1994-09-24T15:00:00Z`	`1994-09-24 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1995-03-25T16:00:00Z`	`1995-03-26 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1995-09-23T15:00:00Z`	`1995-09-23 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1996-03-30T16:00:00Z`	`1996-03-31 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1996-09-28T15:00:00Z`	`1996-09-28 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1997-03-29T16:00:00Z`	`1997-03-30 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1997-09-27T15:00:00Z`	`1997-09-27 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`1998-03-28T16:00:00Z`	`1998-03-29 01:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`1998-09-26T15:00:00Z`	`1998-09-26 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`2001-04-27T18:00:00Z`	`2001-04-28 03:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`2001-09-28T17:00:00Z`	`2001-09-29 01:00:00`	+09:00 → +08:00	`+08`	No	overlap
`2002-03-29T18:00:00Z`	`2002-03-30 03:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`2002-09-27T17:00:00Z`	`2002-09-28 01:00:00`	+09:00 → +08:00	`+08`	No	overlap
`2003-03-28T18:00:00Z`	`2003-03-29 03:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`2003-09-26T17:00:00Z`	`2003-09-27 01:00:00`	+09:00 → +08:00	`+08`	No	overlap
`2004-03-26T18:00:00Z`	`2004-03-27 03:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`2004-09-24T17:00:00Z`	`2004-09-25 01:00:00`	+09:00 → +08:00	`+08`	No	overlap
`2005-03-25T18:00:00Z`	`2005-03-26 03:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`2005-09-23T17:00:00Z`	`2005-09-24 01:00:00`	+09:00 → +08:00	`+08`	No	overlap
`2006-03-24T18:00:00Z`	`2006-03-25 03:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`2006-09-29T17:00:00Z`	`2006-09-30 01:00:00`	+09:00 → +08:00	`+08`	No	overlap
`2015-03-27T18:00:00Z`	`2015-03-28 03:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`2015-09-25T15:00:00Z`	`2015-09-25 23:00:00`	+09:00 → +08:00	`+08`	No	overlap
`2016-03-25T18:00:00Z`	`2016-03-26 03:00:00`	+08:00 → +09:00	`+09`	Yes	gap
`2016-09-23T15:00:00Z`	`2016-09-23 23:00:00`	+09:00 → +08:00	`+08`	No	overlap

Years on Record

Methodology Note: The 1970 Rule

tzdb guarantees accuracy for timestamps from 1970 onwards. Transitions prior to 1970 represent best-effort historical reconstructions.