Time zone · Asia
IRST
Iran Standard Time
Iran Standard Time follows a fixed UTC+03:30 offset year-round, so you never need to adjust for daylight saving shifts in calls or deployments with Tehran.
Thursday, October 15, 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 follows a fixed UTC+03:30 offset year-round, so you never need to adjust for daylight saving shifts in calls or deployments with Tehran.
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 across IRST
Local time, city by city.
16 cities
Where IRST is used
One country.
Convert
IRST to the world's clocks.
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].
- Does Iran observe daylight saving time?
- No. Iran Standard Time stays on UTC+03:30 all year, so there are no spring-forward or fall-back changes to track.
- Why is the offset UTC+03:30 instead of a round hour?
- The half-hour offset reflects Iran’s geographic position and historical choice, placing its clock midway between two full-hour zones.
- How many time zones does Iran have?
- Just one. The whole country uses Iran Standard Time (IRST), UTC+03:30.
- Is the offset ever different in summer?
- No. Since 2022 the offset has remained a steady UTC+03:30 with no seasonal change.
- What’s the time difference with London in winter?
- When London is on GMT (UTC+0), Tehran is 3 hours and 30 minutes ahead.
- What’s the time difference with New York?
- During U.S. Eastern Standard Time (UTC-5), Tehran is 8 hours and 30 minutes ahead; during Eastern Daylight Time (UTC-4), from March to November, it is 7 hours and 30 minutes ahead.
- Do any nearby countries share this offset?
- No neighboring country uses UTC+03:30, making Iran’s offset unique in the region.
- When was the last change to Iran’s time zone?
- The current UTC+03:30 offset has been in effect since September 21, 2022.
Source: IANA tzdb2026d · Reviewed
Free · Developer API
This time zone, as JSON.
Its defining offset, DST status and member counts, from one endpoint.
Also in the API: time zones by coordinates, conversions that flag daylight saving gaps, and abbreviations decoded.
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