Time zone · Asia
IRST
Iran Standard Time
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.
Sunday, May 31, 2026
Current offset
UTC+03:30
Standard · +0330
Daylight saving
Not observed
Year-round standard time
IANA zones
1
None observe daylight saving
DST offset
—
No summer variant
About IRST
A fixed, year-round offset.
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.
IANA zones · the technical identifiers
The zone that resolve to IRST.
For software, always store the IANA identifier — never the abbreviation alone. The database keeps these zones distinct because their rules can, and historically did, diverge.
Cities currently on IRST
The same hour, city by city.
1 city · all UTC+03:30
Where IRST is used
One country.
Frequently asked questions
Common questions about IRST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- 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).
Free · Developer API
Time, as JSON.
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