IRST — Iran Standard Time
IRST is Iran Standard Time, 3 hours 30 minutes ahead of UTC. It is a fixed offset: unlike a time zone, it does not change with the season — the zones that use it switch to a different abbreviation instead.
Current time in IRST
11:16
Sunday, 2 August 2026
IRST = UTC+3:30 · 3 hours 30 minutes ahead of UTC
Shown for 2 Aug 2026 07:46 UTC. The clock goes live as soon as scripts load.
UTC offset
UTC+3:30
Type
Standard time
Seasonal counterpart
None
The zones using it do not change their clocks
Meanings
1
Unambiguous
Is IRST in force right now?
A zone only carries this abbreviation for part of the year. This is which of them were on it at 2 Aug 2026 07:46 UTC; the list is re-derived against your own clock when scripts load.
On IRST now
- Asia/Tehran — Tehran
Using a different abbreviation
- Every zone listed here was on IRST.
Convert IRST to other time zones
City clocks reflect whatever their zone is doing; where a city observes daylight saving time, its difference from IRST changes twice a year. Use the time zone converter for a specific date.
Time zones and cities that use IRST
Iran Standard Time · UTC+3:30
Why IRST is not an identifier
IRST is shorthand, not a standard. There is no registry of time zone abbreviations, no authority that assigns them, and nothing preventing two regions from adopting the same three letters — which is what makes codes like IST and CST unusable without context.
For anything a machine will read — a calendar invitation, a database column, an API response — use the IANA identifier of the zone (Asia/Tehran, for example) or an explicit UTC offset alongside the date. The identifier survives a change in the law; IRST and its 3 hours 30 minutes offset do not.
Frequently asked questions
What does IRST stand for?
IRST stands for Iran Standard Time. It is 3 hours 30 minutes ahead of UTC, written UTC+3:30.
What is IRST in UTC?
IRST is UTC+3:30. To convert an IRST time to UTC, subtract 3 hours 30 minutes.
Which time zone should I use instead of IRST?
Use an IANA identifier — Asia/Tehran for Iran Standard Time — or state the UTC offset with the date. Abbreviations are not identifiers: they are not unique, they are not registered anywhere, and half of them change with the season. Calendar software resolves this automatically when you pick a city rather than typing letters.