IRST

Units & Measurements abbreviation · Time Zone

IRST
Stands forIran Standard Time
CategoriesUnits & Measurements

IRST stands for Iran Standard Time, a time zone abbreviation.

Iran's official time, UTC+3:30, one of the few half-hour offsets in the world. The country observed daylight saving (UTC+4:30) for many years but abolished it from 2023.

Example: The press conference is scheduled for 11:00 IRST in Tehran.

Usage notes

The offset corresponds to the 52.5° E meridian, near the center of Iran. Iran uses the Solar Hijri calendar, whose year begins at the March equinox with Nowruz, so official dates differ from Gregorian ones. Iran's parliament voted in 2022 to stop changing the clocks.

More time zone abbreviations

  • GMT – Greenwich Mean Time
  • GST – Gulf Standard Time
  • HKT – Hong Kong Time
  • HST – Hawaii-Aleutian Standard Time
  • ICT – Indochina Time
  • IDL – International Date Line
  • IST – India Standard Time
  • JST – Japan Standard Time
  • KST – Korea Standard Time
  • LMT – Local mean time
  • LT – Local time
  • MDT – Mountain Daylight Time

See all 64 time zone abbreviations →

Edited by the AbbreviationList.com team. Spotted an error or a missing meaning? Contact us.