Convert Tehran to IST
Convert a time in Tehran to IST, with daylight-saving changes applied for the date you choose.
Tehran to IST
Time in Tehran, Iran
Time in IST, Asia
- Tehran now
- —
- IST now
- —
Time zone details
Tehran, Iran
- IANA zone
- Asia/Tehran
- Standard offset
- UTC+03:30
- Daylight saving
- Not observed
Daylight at the solstices
- 21 June
- 04:50 – 19:24 (14h 35m)
- 21 December
- 07:11 – 16:55 (9h 44m)
IST, Asia
- IANA zone
- Asia/Kolkata
- Standard offset
- UTC+05:30
- Daylight saving
- Not observed
Sunrise and sunset are calculated for the city centre and are accurate to about a minute. Local elevation and atmospheric conditions shift the observed horizon.
Need the reverse direction? Convert IST to Tehran.
Related time zones conversions
Frequently asked questions
What is the time difference between Tehran and IST?+
Tehran is UTC+03:30 and IST is UTC+05:30 in standard time. The gap between them changes during the year if either place observes daylight saving, so enter a date to see the difference on that day.
Does Tehran observe daylight saving time?+
No. Tehran stays on UTC+03:30 all year.
Does IST observe daylight saving time?+
No. IST stays on UTC+05:30 all year.
Why does one local time sometimes have two answers?+
When clocks go back, the hour before the change repeats, so that local reading happens twice and both instants are valid. When clocks go forward, the skipped hour never occurs, so that reading has no matching instant at all. The converter reports both cases rather than guessing.