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Reference.org
Iran Standard Time
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<p>Iran Standard Time (IRST) or Iran Time (IT) is the <a href="/facts/Time_zone/x5JzdlX8">time zone</a> used in Iran. Iran uses a UTC offset <a href="/facts/UTC%252B03%3a30/o48vpVSh">UTC+03:30</a>. IRST is defined by the 52.5 degrees east <a href="/facts/Meridian_(geography)/zdbk1YPt">meridian</a>, the same meridian which defines the <a href="/facts/Iranian_calendar/15wnHmyh">Iranian calendar</a> and is the official meridian of Iran. </p><p>Between 2005 and 2008, by decree of President <a href="/facts/Mahmoud_Ahmadinejad/fxJWaqE6">Mahmoud Ahmadinejad</a>, Iran did not observe <a href="/facts/Daylight_saving_time/bEWvB1Rt">daylight saving time</a> (DST) (called <i>Iran Daylight Time</i> or <i>IRDT</i>). It was reintroduced from 21 March 2008. On 21 September 2022, Iran abolished DST and now observes standard time year-round. </p>