Iran Standard Time (IRST) or Iran Time (IT) is the time zone used in Iran. Iran uses a UTC offset UTC+03:30. IRST is defined by the 52.5 degrees east meridian, the same meridian which defines the Iranian calendar and is the official meridian of Iran.
Between 2005 and 2008, by decree of President Mahmoud Ahmadinejad, Iran did not observe daylight saving time (DST) (called Iran Daylight Time or IRDT).[1] It was reintroduced from 21 March 2008. On 21 September 2022, Iran abolished DST and now observes standard time year-round.[2][3]
The dates of DST transitions in Iran were based on the Solar Hijri calendar, the official calendar of Iran, which is in turn based on the March equinox (Nowruz) as determined by astronomical calculation at the meridian for Iran Standard Time (52.5°E or GMT+3.5h). This resulted in the unique situation wherein the dates of DST transitions didn't fall on the same weekday each year as they do in most other countries.
DST started in Iran at 24:00 on 1 Farvardin, which corresponds to either 20 or 21 March in the Gregorian calendar, depending on the precise timing of the equinox. (This is equivalent to 00:00 on 2 Farvardin, either 21 or 22 March.) Clocks moved forward at that time to 01:00 on 2 Farvardin (21 or 22 March). This spring change took place at the end of the day of Nowruz, which is the IranianNew Year's Day[4] and the most important festival in Iranian culture.
DST likewise ended in Iran at 24:00 on 30 Shahrivar, which corresponds to either 20 or 21 September. (Equivalently, at 00:00 on 31 Shahrivar, either 21 or 22 September). Clocks moved backward to 23:00 on 30 Shahrivar (20 or 21 September).[5][6]
iran, standard, time, irst, iran, time, time, zone, used, iran, iran, uses, offset, irst, defined, degrees, east, meridian, same, meridian, which, defines, iranian, calendar, official, meridian, iran, time, middle, east, egypt, standard, time, 00utc, eastern, . Iran Standard Time IRST or Iran Time IT is the time zone used in Iran Iran uses a UTC offset UTC 03 30 IRST is defined by the 52 5 degrees east meridian the same meridian which defines the Iranian calendar and is the official meridian of Iran Time in the Middle East UTC 02 00 Egypt Standard Time UTC 02 00UTC 03 00 Eastern European Time Israel Standard Time Eastern European Summer Time Israel Summer Time UTC 03 00 Arabia Standard Time Turkey Time UTC 03 30 Iran Standard Time UTC 04 00 Gulf Standard Time Standard time observed all year Daylight saving time observed Between 2005 and 2008 by decree of President Mahmoud Ahmadinejad Iran did not observe daylight saving time DST called Iran Daylight Time or IRDT 1 It was reintroduced from 21 March 2008 On 21 September 2022 Iran abolished DST and now observes standard time year round 2 3 Contents 1 Daylight Saving Time transitions 1 1 Recent and upcoming dates 2 Time zone changes 3 IANA time zone database 4 See also 5 ReferencesDaylight Saving Time transitions EditThe dates of DST transitions in Iran were based on the Solar Hijri calendar the official calendar of Iran which is in turn based on the March equinox Nowruz as determined by astronomical calculation at the meridian for Iran Standard Time 52 5 E or GMT 3 5h This resulted in the unique situation wherein the dates of DST transitions didn t fall on the same weekday each year as they do in most other countries DST started in Iran at 24 00 on 1 Farvardin which corresponds to either 20 or 21 March in the Gregorian calendar depending on the precise timing of the equinox This is equivalent to 00 00 on 2 Farvardin either 21 or 22 March Clocks moved forward at that time to 01 00 on 2 Farvardin 21 or 22 March This spring change took place at the end of the day of Nowruz which is the Iranian New Year s Day 4 and the most important festival in Iranian culture DST likewise ended in Iran at 24 00 on 30 Shahrivar which corresponds to either 20 or 21 September Equivalently at 00 00 on 31 Shahrivar either 21 or 22 September Clocks moved backward to 23 00 on 30 Shahrivar 20 or 21 September 5 6 Recent and upcoming dates Edit Year 7 DST Start DST End2017 Wed Mar 22 00 00 Fri Sep 22 00 002018 Thu Mar 22 00 00 Sat Sep 22 00 002019 Fri Mar 22 00 00 Sun Sep 22 00 002020 Sat Mar 21 00 00 Mon Sep 21 00 002021 Mon Mar 22 00 00 Wed Sep 22 00 002022 Tue Mar 22 00 00 Thu Sep 22 00 00Time zone changes EditPeriod in use Time offset from GMT Name of timebefore 1945 UTC 03 25 44 Tehran Mean Time TMT 1946 1977 UTC 03 30 Iran Standard Time IRST 1977 1978 UTC 04 00 UTC 05 00 Iran Standard Time IRST Iran Daylight Time IRDT 1979 1980 UTC 03 30 UTC 04 30 Iran Standard Time IRST Iran Daylight Time IRDT 1981 1990 UTC 03 30 Iran Standard Time IRST 1991 2005 UTC 03 30 UTC 04 30 Iran Standard Time IRST Iran Daylight Time IRDT 2006 2007 UTC 03 30 Iran Standard Time IRST 2008 2022 UTC 03 30 UTC 04 30 Iran Standard Time IRST Iran Daylight Time IRDT 2022 present UTC 03 30 Iran Standard Time IRST IANA time zone database EditThe IANA time zone database contains one zone for Iran in the file zone tab named Asia Tehran See also Edit Iran portalIranian calendarsReferences Edit Time zone and daylight saving time for Iran Tehran between 2010 and 2019 Timeanddate com Retrieved 9 May 2010 Iran Considers Abolishing DST timeanddate com Retrieved 13 May 2022 Daylight Saving Time Ends in Iran Livingintehran com 2022 09 21 Culture of Iran No Rooz The Iranian New Year at Present Times www iranchamber com Retrieved 1 February 2016 Roozbeh Pournader 15 March 2003 Iran daylight saving time correction Retrieved 1 December 2018 tz database 30 November 2018 asia file lines 1278 1299 GitHub Retrieved 1 December 2018 Time Changes in Tehran over the years This Iran related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Iran Standard Time amp oldid 1116638769, wikipedia, wiki, book, books, library,
