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About IRST
Iran Standard Time (IRST) is the official time zone used in Iran throughout the year. The time zone offset of IRST is UTC+03:30, which means it is 3 hours and 30 minutes ahead of Coordinated Universal Time (UTC).
Iran Standard Time is used across the entire country of Iran, including major cities such as Tehran, Mashhad, Isfahan, Shiraz, and Tabriz.
Iran does not consistently follow daylight saving time in recent years, so IRST remains the standard time throughout most of the year with a fixed offset of UTC+03:30.