Convert IST to Tehran
Convert a time in IST to Tehran, with daylight-saving changes applied for the date you choose.
IST to Tehran
Time in IST, Asia
Time in Tehran, Iran
- IST now
- —
- Tehran now
- —
Time zone details
IST, Asia
- IANA zone
- Asia/Kolkata
- Standard offset
- UTC+05:30
- Daylight saving
- Not observed
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)
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 Tehran to IST.
Related time zones conversions
Frequently asked questions
What is the time difference between IST and Tehran?+
IST is UTC+05:30 and Tehran is UTC+03:30 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 IST observe daylight saving time?+
No. IST stays on UTC+05:30 all year.
Does Tehran observe daylight saving time?+
No. Tehran stays on UTC+03:30 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.