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Iran Standard Time
Identifier for a time offset from UTC of +03:30

Iran Standard Time (IRST), also known as Iran Time (IT), is the official time zone of Iran, operating at a UTC+03:30 offset. IRST is based on the 52.5 degrees east meridian, which also defines the Iranian calendar. From 2005 to 2008, under President Mahmoud Ahmadinejad, Iran suspended the use of daylight saving time (IRDT), but it was reinstated in March 2008. However, as of 21 September 2022, Iran abolished DST permanently and now observes standard time throughout the year.

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Daylight Saving Time transitions

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 Iranian New Year's Day4 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).56

Time zone changes

Period in useTime offset from GMTName of time
before 1945UTC+03:25:44Tehran Mean Time (TMT)
1946 – 1977UTC+03:30Iran Standard Time (IRST)
1977 – 1978UTC+04:00 UTC+05:00Iran Standard Time (IRST) Iran Daylight Time (IRDT)
1979 – 1980UTC+03:30 UTC+04:30Iran Standard Time (IRST) Iran Daylight Time (IRDT)
1981 – 1990UTC+03:30Iran Standard Time (IRST)
1991 – 2005UTC+03:30 UTC+04:30Iran Standard Time (IRST) Iran Daylight Time (IRDT)
2006 – 2007UTC+03:30Iran Standard Time (IRST)
2008 – 2022UTC+03:30 UTC+04:30Iran Standard Time (IRST) Iran Daylight Time (IRDT)
2022 – presentUTC+03:30Iran Standard Time (IRST)

See also

  • Iran portal

References

  1. "Time zone and daylight saving time for Iran – Tehran between 2010 and 2019". Timeanddate.com. Retrieved 9 May 2010. http://timeanddate.com/worldclock/timezone.html?n=246 ↩

  2. "Iran Considers Abolishing DST". timeanddate.com. Retrieved 13 May 2022. https://www.timeanddate.com/news/time/iran-dst-2022.html ↩

  3. "Daylight Saving Time Ends in Iran". Livingintehran.com. 2022-09-21. https://livingintehran.com/2022/09/21/daylight-saving-time-ends-in-iran/ ↩

  4. "Culture of Iran: No-Rooz, The Iranian New Year at Present Times". www.iranchamber.com. Retrieved 1 February 2016. http://www.iranchamber.com/culture/articles/norooz_iranian_new_year.php ↩

  5. Roozbeh Pournader (15 March 2003). "Iran daylight saving time correction". Retrieved 1 December 2018. https://mm.icann.org/pipermail/tz/2003-March/012052.html ↩

  6. tz database (30 November 2018). "asia file, lines 1278–1299". GitHub. Retrieved 1 December 2018. /wiki/Tz_database ↩