America/Thule

Time zone identifier: America/Thule

Current civil offset: -04:00 (AST)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1916-07-28

Local Mean Time (LMT): -04:35:08 based on geographic meridian

Total recorded transitions: 95 transitions across 3 distinct offsets

Associated countries: GL

Historical Offset Step Chart (1880 to Present)

Text summary: America/Thule shifted between 3 distinct offsets from 1916-07-28 through the modern era.

Complete Transition History (95 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1916-07-28T04:35:08Z`	`1916-07-28 00:35:08`	-04:35:08 → -04:00	`AST`	No	gap
`1991-03-31T06:00:00Z`	`1991-03-31 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`1991-09-29T05:00:00Z`	`1991-09-29 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`1992-03-29T06:00:00Z`	`1992-03-29 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`1992-09-27T05:00:00Z`	`1992-09-27 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`1993-04-04T06:00:00Z`	`1993-04-04 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`1993-10-31T05:00:00Z`	`1993-10-31 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`1994-04-03T06:00:00Z`	`1994-04-03 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`1994-10-30T05:00:00Z`	`1994-10-30 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`1995-04-02T06:00:00Z`	`1995-04-02 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`1995-10-29T05:00:00Z`	`1995-10-29 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`1996-04-07T06:00:00Z`	`1996-04-07 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`1996-10-27T05:00:00Z`	`1996-10-27 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`1997-04-06T06:00:00Z`	`1997-04-06 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`1997-10-26T05:00:00Z`	`1997-10-26 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`1998-04-05T06:00:00Z`	`1998-04-05 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`1998-10-25T05:00:00Z`	`1998-10-25 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`1999-04-04T06:00:00Z`	`1999-04-04 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`1999-10-31T05:00:00Z`	`1999-10-31 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2000-04-02T06:00:00Z`	`2000-04-02 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2000-10-29T05:00:00Z`	`2000-10-29 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2001-04-01T06:00:00Z`	`2001-04-01 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2001-10-28T05:00:00Z`	`2001-10-28 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2002-04-07T06:00:00Z`	`2002-04-07 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2002-10-27T05:00:00Z`	`2002-10-27 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2003-04-06T06:00:00Z`	`2003-04-06 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2003-10-26T05:00:00Z`	`2003-10-26 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2004-04-04T06:00:00Z`	`2004-04-04 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2004-10-31T05:00:00Z`	`2004-10-31 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2005-04-03T06:00:00Z`	`2005-04-03 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2005-10-30T05:00:00Z`	`2005-10-30 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2006-04-02T06:00:00Z`	`2006-04-02 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2006-10-29T05:00:00Z`	`2006-10-29 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2007-03-11T06:00:00Z`	`2007-03-11 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2007-11-04T05:00:00Z`	`2007-11-04 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2008-03-09T06:00:00Z`	`2008-03-09 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2008-11-02T05:00:00Z`	`2008-11-02 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2009-03-08T06:00:00Z`	`2009-03-08 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2009-11-01T05:00:00Z`	`2009-11-01 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2010-03-14T06:00:00Z`	`2010-03-14 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2010-11-07T05:00:00Z`	`2010-11-07 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2011-03-13T06:00:00Z`	`2011-03-13 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2011-11-06T05:00:00Z`	`2011-11-06 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2012-03-11T06:00:00Z`	`2012-03-11 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2012-11-04T05:00:00Z`	`2012-11-04 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2013-03-10T06:00:00Z`	`2013-03-10 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2013-11-03T05:00:00Z`	`2013-11-03 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2014-03-09T06:00:00Z`	`2014-03-09 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2014-11-02T05:00:00Z`	`2014-11-02 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2015-03-08T06:00:00Z`	`2015-03-08 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2015-11-01T05:00:00Z`	`2015-11-01 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2016-03-13T06:00:00Z`	`2016-03-13 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2016-11-06T05:00:00Z`	`2016-11-06 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2017-03-12T06:00:00Z`	`2017-03-12 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2017-11-05T05:00:00Z`	`2017-11-05 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2018-03-11T06:00:00Z`	`2018-03-11 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2018-11-04T05:00:00Z`	`2018-11-04 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2019-03-10T06:00:00Z`	`2019-03-10 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2019-11-03T05:00:00Z`	`2019-11-03 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2020-03-08T06:00:00Z`	`2020-03-08 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2020-11-01T05:00:00Z`	`2020-11-01 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2021-03-14T06:00:00Z`	`2021-03-14 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2021-11-07T05:00:00Z`	`2021-11-07 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2022-03-13T06:00:00Z`	`2022-03-13 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2022-11-06T05:00:00Z`	`2022-11-06 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2023-03-12T06:00:00Z`	`2023-03-12 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2023-11-05T05:00:00Z`	`2023-11-05 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2024-03-10T06:00:00Z`	`2024-03-10 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2024-11-03T05:00:00Z`	`2024-11-03 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2025-03-09T06:00:00Z`	`2025-03-09 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2025-11-02T05:00:00Z`	`2025-11-02 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2026-03-08T06:00:00Z`	`2026-03-08 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2026-11-01T05:00:00Z`	`2026-11-01 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2027-03-14T06:00:00Z`	`2027-03-14 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2027-11-07T05:00:00Z`	`2027-11-07 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2028-03-12T06:00:00Z`	`2028-03-12 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2028-11-05T05:00:00Z`	`2028-11-05 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2029-03-11T06:00:00Z`	`2029-03-11 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2029-11-04T05:00:00Z`	`2029-11-04 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2030-03-10T06:00:00Z`	`2030-03-10 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2030-11-03T05:00:00Z`	`2030-11-03 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2031-03-09T06:00:00Z`	`2031-03-09 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2031-11-02T05:00:00Z`	`2031-11-02 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2032-03-14T06:00:00Z`	`2032-03-14 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2032-11-07T05:00:00Z`	`2032-11-07 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2033-03-13T06:00:00Z`	`2033-03-13 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2033-11-06T05:00:00Z`	`2033-11-06 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2034-03-12T06:00:00Z`	`2034-03-12 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2034-11-05T05:00:00Z`	`2034-11-05 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2035-03-11T06:00:00Z`	`2035-03-11 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2035-11-04T05:00:00Z`	`2035-11-04 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2036-03-09T06:00:00Z`	`2036-03-09 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2036-11-02T05:00:00Z`	`2036-11-02 01:00:00`	-03:00 → -04:00	`AST`	No	overlap
`2037-03-08T06:00:00Z`	`2037-03-08 03:00:00`	-04:00 → -03:00	`ADT`	Yes	gap
`2037-11-01T05:00:00Z`	`2037-11-01 01:00:00`	-03:00 → -04:00	`AST`	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.