Zone NAME STDOFF RULES FORMAT [UNTIL]
Asia/Tehran
Time zone identifier: Asia/Tehran
Current civil offset: +03:30 (+0330)
Current DST state: Observing Standard Time
First standard time adoption: Adopted on 1915-12-31
Local Mean Time (LMT): +03:25:44 based on geographic meridian
Total recorded transitions: 71 transitions across 5 distinct offsets
Associated countries: IR
Aliases (Link targets): Iran
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Historical Offset Step Chart (1880 to Present)
Text summary: Asia/Tehran shifted between 5 distinct offsets from 1915-12-31 through the modern era.
Complete Transition History (71 Transitions)
| UTC Instant | Local Wall Time | Shift | Abbreviation | DST | Effect |
|---|---|---|---|---|---|
1915-12-31T20:34:16Z | 1916-01-01 00:00:00 | +03:25:44 → +03:25:44 | TMT | No | offset-only |
1935-06-12T20:34:16Z | 1935-06-13 00:04:16 | +03:25:44 → +03:30 | +0330 | No | gap |
1977-03-21T19:30:00Z | 1977-03-22 00:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1977-10-20T19:30:00Z | 1977-10-20 23:30:00 | +04:30 → +04:00 | +04 | No | overlap |
1978-03-24T20:00:00Z | 1978-03-25 01:00:00 | +04:00 → +05:00 | +05 | Yes | gap |
1978-08-04T20:00:00Z | 1978-08-05 00:00:00 | +05:00 → +04:00 | +04 | No | overlap |
1978-11-10T20:00:00Z | 1978-11-10 23:30:00 | +04:00 → +03:30 | +0330 | No | overlap |
1979-05-25T20:30:00Z | 1979-05-26 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1979-09-18T19:30:00Z | 1979-09-18 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
1980-03-20T20:30:00Z | 1980-03-21 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1980-09-22T19:30:00Z | 1980-09-22 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
1991-05-02T20:30:00Z | 1991-05-03 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1991-09-21T19:30:00Z | 1991-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
1992-03-21T20:30:00Z | 1992-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1992-09-21T19:30:00Z | 1992-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
1993-03-21T20:30:00Z | 1993-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1993-09-21T19:30:00Z | 1993-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
1994-03-21T20:30:00Z | 1994-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1994-09-21T19:30:00Z | 1994-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
1995-03-21T20:30:00Z | 1995-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1995-09-21T19:30:00Z | 1995-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
1996-03-20T20:30:00Z | 1996-03-21 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1996-09-20T19:30:00Z | 1996-09-20 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
1997-03-21T20:30:00Z | 1997-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1997-09-21T19:30:00Z | 1997-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
1998-03-21T20:30:00Z | 1998-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1998-09-21T19:30:00Z | 1998-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
1999-03-21T20:30:00Z | 1999-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
1999-09-21T19:30:00Z | 1999-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2000-03-20T20:30:00Z | 2000-03-21 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2000-09-20T19:30:00Z | 2000-09-20 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2001-03-21T20:30:00Z | 2001-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2001-09-21T19:30:00Z | 2001-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2002-03-21T20:30:00Z | 2002-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2002-09-21T19:30:00Z | 2002-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2003-03-21T20:30:00Z | 2003-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2003-09-21T19:30:00Z | 2003-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2004-03-20T20:30:00Z | 2004-03-21 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2004-09-20T19:30:00Z | 2004-09-20 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2005-03-21T20:30:00Z | 2005-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2005-09-21T19:30:00Z | 2005-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2008-03-20T20:30:00Z | 2008-03-21 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2008-09-20T19:30:00Z | 2008-09-20 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2009-03-21T20:30:00Z | 2009-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2009-09-21T19:30:00Z | 2009-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2010-03-21T20:30:00Z | 2010-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2010-09-21T19:30:00Z | 2010-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2011-03-21T20:30:00Z | 2011-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2011-09-21T19:30:00Z | 2011-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2012-03-20T20:30:00Z | 2012-03-21 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2012-09-20T19:30:00Z | 2012-09-20 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2013-03-21T20:30:00Z | 2013-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2013-09-21T19:30:00Z | 2013-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2014-03-21T20:30:00Z | 2014-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2014-09-21T19:30:00Z | 2014-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2015-03-21T20:30:00Z | 2015-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2015-09-21T19:30:00Z | 2015-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2016-03-20T20:30:00Z | 2016-03-21 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2016-09-20T19:30:00Z | 2016-09-20 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2017-03-21T20:30:00Z | 2017-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2017-09-21T19:30:00Z | 2017-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2018-03-21T20:30:00Z | 2018-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2018-09-21T19:30:00Z | 2018-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2019-03-21T20:30:00Z | 2019-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2019-09-21T19:30:00Z | 2019-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2020-03-20T20:30:00Z | 2020-03-21 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2020-09-20T19:30:00Z | 2020-09-20 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2021-03-21T20:30:00Z | 2021-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2021-09-21T19:30:00Z | 2021-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
2022-03-21T20:30:00Z | 2022-03-22 01:00:00 | +03:30 → +04:30 | +0430 | Yes | gap |
2022-09-21T19:30:00Z | 2022-09-21 23:00:00 | +04:30 → +03:30 | +0330 | No | overlap |
Notes from the Maintainers
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.
asia(Lines 1647 to 1648)