Historically distinct IANA time zone
America/Adak
Local time now
HDT · current offset
- Countries
- United States of America
- GPS reference
- 51.88° N, 176.66° W
- Data source
- IANA northamerica
- Aliases
- America/Atka, US/Aleutian
- Rule groups
- US
United States of AmericaAlaska - western Aleutians
Geographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 51.88° N, 176.66° W. Associated countries: US.
The Wikipedia link provides additional context; it is not evidence for a historical claim. Transition data comes from the IANA source file.
Notes from the time database
The story behind the clock
These source notes describe a period or rule. They do not, by themselves, establish a causal claim for a particular clock change.
War
Peace
Original IANA source file: northamerica.
Civil-time record
Recorded changes over time
From 1867 to 2027 · 125 recorded transitions
Recurring daylight-saving changes are grouped separately when JavaScript is available.
Notable changes
One-off changes and transitions outside the recurring seasonal rhythm.
- -11:46 · LMTStandard time applies
- -11:00 · NSTStandard time applies
- -10:00 · NWTDaylight saving time begins
- -10:00 · NPTDaylight saving time begins
- -11:00 · NSTStandard time applies
- -11:00 · BSTStandard time applies
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1867-10-18 12:44 | -11:46 | LMT | Standard time |
| 1900-08-20 12:46 | -11:00 | NST | Standard time |
| 1942-02-09 03:00 | -10:00 | NWT | Daylight saving time |
| 1945-08-14 13:00 | -10:00 | NPT | Daylight saving time |
| 1945-09-30 01:00 | -11:00 | NST | Standard time |
| 1967-04-01 00:00 | -11:00 | BST | Standard time |
| 1969-04-27 03:00 | -10:00 | BDT | Daylight saving time |
| 1969-10-26 01:00 | -11:00 | BST | Standard time |
| 1970-04-26 03:00 | -10:00 | BDT | Daylight saving time |
| 1970-10-25 01:00 | -11:00 | BST | Standard time |
| 1971-04-25 03:00 | -10:00 | BDT | Daylight saving time |
| 1971-10-31 01:00 | -11:00 | BST | Standard time |
| 1972-04-30 03:00 | -10:00 | BDT | Daylight saving time |
| 1972-10-29 01:00 | -11:00 | BST | Standard time |
| 1973-04-29 03:00 | -10:00 | BDT | Daylight saving time |
| 1973-10-28 01:00 | -11:00 | BST | Standard time |
| 1974-01-06 03:00 | -10:00 | BDT | Daylight saving time |
| 1974-10-27 01:00 | -11:00 | BST | Standard time |
| 1975-02-23 03:00 | -10:00 | BDT | Daylight saving time |
| 1975-10-26 01:00 | -11:00 | BST | Standard time |
| 1976-04-25 03:00 | -10:00 | BDT | Daylight saving time |
| 1976-10-31 01:00 | -11:00 | BST | Standard time |
| 1977-04-24 03:00 | -10:00 | BDT | Daylight saving time |
| 1977-10-30 01:00 | -11:00 | BST | Standard time |
| 1978-04-30 03:00 | -10:00 | BDT | Daylight saving time |
| 1978-10-29 01:00 | -11:00 | BST | Standard time |
| 1979-04-29 03:00 | -10:00 | BDT | Daylight saving time |
| 1979-10-28 01:00 | -11:00 | BST | Standard time |
| 1980-04-27 03:00 | -10:00 | BDT | Daylight saving time |
| 1980-10-26 01:00 | -11:00 | BST | Standard time |
| 1981-04-26 03:00 | -10:00 | BDT | Daylight saving time |
| 1981-10-25 01:00 | -11:00 | BST | Standard time |
| 1982-04-25 03:00 | -10:00 | BDT | Daylight saving time |
| 1982-10-31 01:00 | -11:00 | BST | Standard time |
| 1983-04-24 03:00 | -10:00 | BDT | Daylight saving time |
| 1983-10-30 02:00 | -10:00 | AHST | Standard time |
| 1983-11-30 00:00 | -10:00 | HST | Standard time |
| 1984-04-29 03:00 | -09:00 | HDT | Daylight saving time |
| 1984-10-28 01:00 | -10:00 | HST | Standard time |
| 1985-04-28 03:00 | -09:00 | HDT | Daylight saving time |
| 1985-10-27 01:00 | -10:00 | HST | Standard time |
| 1986-04-27 03:00 | -09:00 | HDT | Daylight saving time |
| 1986-10-26 01:00 | -10:00 | HST | Standard time |
| 1987-04-05 03:00 | -09:00 | HDT | Daylight saving time |
| 1987-10-25 01:00 | -10:00 | HST | Standard time |
| 1988-04-03 03:00 | -09:00 | HDT | Daylight saving time |
| 1988-10-30 01:00 | -10:00 | HST | Standard time |
| 1989-04-02 03:00 | -09:00 | HDT | Daylight saving time |
| 1989-10-29 01:00 | -10:00 | HST | Standard time |
| 1990-04-01 03:00 | -09:00 | HDT | Daylight saving time |
| 1990-10-28 01:00 | -10:00 | HST | Standard time |
| 1991-04-07 03:00 | -09:00 | HDT | Daylight saving time |
| 1991-10-27 01:00 | -10:00 | HST | Standard time |
| 1992-04-05 03:00 | -09:00 | HDT | Daylight saving time |
| 1992-10-25 01:00 | -10:00 | HST | Standard time |
| 1993-04-04 03:00 | -09:00 | HDT | Daylight saving time |
| 1993-10-31 01:00 | -10:00 | HST | Standard time |
| 1994-04-03 03:00 | -09:00 | HDT | Daylight saving time |
| 1994-10-30 01:00 | -10:00 | HST | Standard time |
| 1995-04-02 03:00 | -09:00 | HDT | Daylight saving time |
| 1995-10-29 01:00 | -10:00 | HST | Standard time |
| 1996-04-07 03:00 | -09:00 | HDT | Daylight saving time |
| 1996-10-27 01:00 | -10:00 | HST | Standard time |
| 1997-04-06 03:00 | -09:00 | HDT | Daylight saving time |
| 1997-10-26 01:00 | -10:00 | HST | Standard time |
| 1998-04-05 03:00 | -09:00 | HDT | Daylight saving time |
| 1998-10-25 01:00 | -10:00 | HST | Standard time |
| 1999-04-04 03:00 | -09:00 | HDT | Daylight saving time |
| 1999-10-31 01:00 | -10:00 | HST | Standard time |
| 2000-04-02 03:00 | -09:00 | HDT | Daylight saving time |
| 2000-10-29 01:00 | -10:00 | HST | Standard time |
| 2001-04-01 03:00 | -09:00 | HDT | Daylight saving time |
| 2001-10-28 01:00 | -10:00 | HST | Standard time |
| 2002-04-07 03:00 | -09:00 | HDT | Daylight saving time |
| 2002-10-27 01:00 | -10:00 | HST | Standard time |
| 2003-04-06 03:00 | -09:00 | HDT | Daylight saving time |
| 2003-10-26 01:00 | -10:00 | HST | Standard time |
| 2004-04-04 03:00 | -09:00 | HDT | Daylight saving time |
| 2004-10-31 01:00 | -10:00 | HST | Standard time |
| 2005-04-03 03:00 | -09:00 | HDT | Daylight saving time |
| 2005-10-30 01:00 | -10:00 | HST | Standard time |
| 2006-04-02 03:00 | -09:00 | HDT | Daylight saving time |
| 2006-10-29 01:00 | -10:00 | HST | Standard time |
| 2007-03-11 03:00 | -09:00 | HDT | Daylight saving time |
| 2007-11-04 01:00 | -10:00 | HST | Standard time |
| 2008-03-09 03:00 | -09:00 | HDT | Daylight saving time |
| 2008-11-02 01:00 | -10:00 | HST | Standard time |
| 2009-03-08 03:00 | -09:00 | HDT | Daylight saving time |
| 2009-11-01 01:00 | -10:00 | HST | Standard time |
| 2010-03-14 03:00 | -09:00 | HDT | Daylight saving time |
| 2010-11-07 01:00 | -10:00 | HST | Standard time |
| 2011-03-13 03:00 | -09:00 | HDT | Daylight saving time |
| 2011-11-06 01:00 | -10:00 | HST | Standard time |
| 2012-03-11 03:00 | -09:00 | HDT | Daylight saving time |
| 2012-11-04 01:00 | -10:00 | HST | Standard time |
| 2013-03-10 03:00 | -09:00 | HDT | Daylight saving time |
| 2013-11-03 01:00 | -10:00 | HST | Standard time |
| 2014-03-09 03:00 | -09:00 | HDT | Daylight saving time |
| 2014-11-02 01:00 | -10:00 | HST | Standard time |
| 2015-03-08 03:00 | -09:00 | HDT | Daylight saving time |
| 2015-11-01 01:00 | -10:00 | HST | Standard time |
| 2016-03-13 03:00 | -09:00 | HDT | Daylight saving time |
| 2016-11-06 01:00 | -10:00 | HST | Standard time |
| 2017-03-12 03:00 | -09:00 | HDT | Daylight saving time |
| 2017-11-05 01:00 | -10:00 | HST | Standard time |
| 2018-03-11 03:00 | -09:00 | HDT | Daylight saving time |
| 2018-11-04 01:00 | -10:00 | HST | Standard time |
| 2019-03-10 03:00 | -09:00 | HDT | Daylight saving time |
| 2019-11-03 01:00 | -10:00 | HST | Standard time |
| 2020-03-08 03:00 | -09:00 | HDT | Daylight saving time |
| 2020-11-01 01:00 | -10:00 | HST | Standard time |
| 2021-03-14 03:00 | -09:00 | HDT | Daylight saving time |
| 2021-11-07 01:00 | -10:00 | HST | Standard time |
| 2022-03-13 03:00 | -09:00 | HDT | Daylight saving time |
| 2022-11-06 01:00 | -10:00 | HST | Standard time |
| 2023-03-12 03:00 | -09:00 | HDT | Daylight saving time |
| 2023-11-05 01:00 | -10:00 | HST | Standard time |
| 2024-03-10 03:00 | -09:00 | HDT | Daylight saving time |
| 2024-11-03 01:00 | -10:00 | HST | Standard time |
| 2025-03-09 03:00 | -09:00 | HDT | Daylight saving time |
| 2025-11-02 01:00 | -10:00 | HST | Standard time |
| 2026-03-08 03:00 | -09:00 | HDT | Daylight saving time |
| 2026-11-01 01:00 | -10:00 | HST | Standard time |
| 2027-03-14 03:00 | -09:00 | HDT | Daylight saving time |
| 2027-11-07 01:00 | -10:00 | HST | Standard time |