Tehran

Asia • Tehran

Iran

Current local time

07:43:59

Sunday, May 31, 2026

UTC offset

UTC+03:30

No daylight saving changes

Tehran does not observe daylight saving time. Clocks stay on UTC+03:30 all year long.

Timezone details

Identifier
Abbreviation
—
Transitioned
September 21, 2022 at 11:00 PM
Featured city
Tehran

Location

Latitude
35.66666
Longitude
51.43333
Country
Iran

Iran Standard Time (IRST)

FAQs

Iran Standard Time (IRST) keeps things simple with a single, year-round offset of UTC+03:30—no daylight saving changes to track. Whether you're coordinating with Tehran or planning across Iran, you can rely on a consistent clock that stays put all year long.

  • Why doesn’t Iran observe daylight saving time?

    Iran permanently stopped observing daylight saving time in 2022, opting for a fixed standard time year-round to simplify scheduling and reduce confusion.

  • What makes IRST’s offset unusual?

    The UTC+03:30 offset is one of the few time zones worldwide that uses a half-hour deviation from UTC, making it stand apart from most full-hour offsets.

  • How does IRST affect international meetings?

    Because IRST doesn’t shift for DST, its relationship with other time zones remains constant—making it easier to plan recurring calls with partners in Europe, the Middle East, or South Asia.

  • Is Asia/Tehran the only zone in IRST?

    Yes, Asia/Tehran is the sole representative of Iran Standard Time, covering the entire country under one consistent offset.

  • When did Iran last change its time policy?

    Iran made its current UTC+03:30 offset permanent on September 21, 2022, ending decades of seasonal clock adjustments.

  • How does IRST compare to neighboring countries?

    Unlike some neighbors that use full-hour offsets or observe DST, Iran’s fixed +03:30 creates unique time differences—for example, it’s 30 minutes ahead of Iraq (UTC+03:00) and 90 minutes behind Pakistan (UTC+05:00).