Istanbul and Tehran have a 0,5-hour time difference.
🇹🇷 Istanbul
UTC+3
🇮🇷 Tehran
UTC+3:30
Tehran is 0,5 hours ahead of Istanbul
Istanbul (UTC+3) and Tehran (UTC+3:30) have a 0,5-hour time difference. The 24-hour table below shows the local time in both cities for every UTC hour.
Istanbul and Tehran share 9 hours of business-hours overlap (09:00–18:00 local). The overlap window starts around 09:00 and ends around 17:00 (Istanbul local time).
| UTC Hour | 🇹🇷 Istanbul | 🇮🇷 Tehran |
|---|---|---|
| 00:00 UTC | 03:00 | 03:30 |
| 01:00 UTC | 04:00 | 04:30 |
| 02:00 UTC | 05:00 | 05:30 |
| 03:00 UTC | 06:00 | 06:30 |
| 04:00 UTC | 07:00 | 07:30 |
| 05:00 UTC | 08:00 | 08:30 |
| 06:00 UTCBoth at work | 09:00 | 09:30 |
| 07:00 UTCBoth at work | 10:00 | 10:30 |
| 08:00 UTCBoth at work | 11:00 | 11:30 |
| 09:00 UTCBoth at work | 12:00 | 12:30 |
| 10:00 UTCBoth at work | 13:00 | 13:30 |
| 11:00 UTCBoth at work | 14:00 | 14:30 |
| 12:00 UTCBoth at work | 15:00 | 15:30 |
| 13:00 UTCBoth at work | 16:00 | 16:30 |
| 14:00 UTCBoth at work | 17:00 | 17:30 |
| 15:00 UTC | 18:00 | 18:30 |
| 16:00 UTC | 19:00 | 19:30 |
| 17:00 UTC | 20:00 | 20:30 |
| 18:00 UTC | 21:00 | 21:30 |
| 19:00 UTC | 22:00 | 22:30 |
| 20:00 UTC | 23:00 | 23:30 |
| 21:00 UTC | 00:00 | 00:30 |
| 22:00 UTC | 01:00 | 01:30 |
| 23:00 UTC | 02:00 | 02:30 |
Green rows = both cities in business hours (09:00–18:00 local). Times shown for current DST offset.
Time difference is the gap between local times in two cities or countries. Earth is divided into 24 time zones, each with a UTC offset. For example, a city at UTC+2 and a city at UTC+5 are 3 hours apart.
Yes, Daylight Saving Time can shift the time difference between two countries by 1 hour. The US, Canada, and most European countries advance their clocks in spring. Some Asian and Middle Eastern countries do not observe DST, keeping a fixed offset year-round.
UTC (Coordinated Universal Time) is the universal time standard all time zones reference. Time difference is calculated by subtracting the UTC offsets of two cities — for example, UTC+2 and UTC+5 are 3 hours apart. The IANA database tracks all offsets in real time.
The US, Canada, EU countries, Australia, and New Zealand are the main DST-observing regions. Japan, China, India, and several Middle Eastern countries do not observe DST. This means time differences can shift by 1 hour between summer and winter periods.
There is a 0,5-hour time difference between Istanbul and Tehran. Due to Daylight Saving Time, this may shift by ±1 hour seasonally. The 24-hour timeline above shows the live, accurate difference.
The best time to call between Istanbul (UTC+3) and Tehran (UTC+3:30) is when both cities are within normal working hours (09:00–18:00). There is a 0,5-hour time difference — check the 24-hour table above to find the overlapping window.
Some countries shift their clocks by 1 hour in spring and autumn (Daylight Saving Time), which can temporarily change the time difference between Istanbul and Tehran. now:clock uses the IANA time zone database and always shows the current, live difference.