Surf Wiki
Save to docs
geography/iran

From Surf Wiki (app.surf) — the open knowledge base

Iran Standard Time

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

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

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). It was reintroduced from 21 March 2008. On 21 September 2022, Iran abolished DST and now observes standard time year-round.

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 did not 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 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).

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)

References

References

  1. "Time zone and daylight saving time for Iran – Tehran between 2010 and 2019". Timeanddate.com.
  2. "Iran Considers Abolishing DST".
  3. (2022-09-21). "Daylight Saving Time Ends in Iran".
  4. "Culture of Iran: No-Rooz, The Iranian New Year at Present Times".
  5. Roozbeh Pournader. (15 March 2003). "Iran daylight saving time correction".
  6. tz database. (30 November 2018). "asia file, lines 1278–1299".
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

time-in-iran time-zones
Want to explore this topic further?

Ask Mako anything about Iran Standard Time — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report