Iran Standard Time

Time in the Middle East

	UTC+02:00	Eastern European Time
	UTC+02:00 UTC+03:00	Eastern European Time / Israel Standard Time / Palestine Standard Time Eastern European Summer Time / Israel Summer Time / Palestine Summer Time
	UTC+03:00	Turkey Time Arabia Standard Time
	UTC+03:30 UTC+04:30	Iran Standard Time Iran Daylight Time
	UTC+04:00	Gulf Standard Time

Light colors indicate where standard time is observed all year; dark colors indicate where daylight savings is observed.

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 (called Iran Daylight Time or IRDT).^[1][2] It was reintroduced from 21 March 2008.

Daylight Saving Transitions Dates

Iran is unusual in that the dates of DST transitions aren't based on a rule such as the third Monday in September. So in most countries, DST transitions occur on the same weekday every year, but not in Iran.^[3] This means that the spring change occurs very close to Nowruz, the most important festival in Iranian culture.

The Iranian DST starts on March 22 and ends on September 22 each year with the exception of leapyears in which the DST starts and ends one day prior.

Time zone changes

IANA time zone database

The IANA time zone database contains one zone for Iran in the file zone.tab, named Asia/Tehran.

See also

• Iranian calendars

References