Tehran Time to GMT Converter
GMT is 3 hours 30 minutes behind IRST. 9:00 AM IRST = 5:30 AM GMT.
GMT is 3 hours 30 minutes behind IRST. To convert Tehran Time to GMT, subtract 3 hours 30 minutes from the Tehran Time time: 9:00 AM IRST = 5:30 AM GMT.
Tehran Time (Tehran time) is used in Tehran, Iran. GMT (GMT) is used in Same offset as UTC. The UK and Ireland use GMT in winter; Iceland, Ghana and Senegal all year.
The UK is on GMT only in winter; in summer it uses BST (UTC+1).
Tehran Time to GMT time conversion table
Tehran Time to GMT on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| Tehran Time | GMT | Day |
|---|---|---|
| 12:00 AM IRST | 8:30 PM GMT | previous day |
| 1:00 AM IRST | 9:30 PM GMT | previous day |
| 2:00 AM IRST | 10:30 PM GMT | previous day |
| 3:00 AM IRST | 11:30 PM GMT | previous day |
| 4:00 AM IRST | 12:30 AM GMT | night |
| 5:00 AM IRST | 1:30 AM GMT | night |
| 6:00 AM IRST | 2:30 AM GMT | night |
| 7:00 AM IRST | 3:30 AM GMT | night |
| 8:00 AM IRST | 4:30 AM GMT | night |
| 9:00 AM IRST | 5:30 AM GMT | night |
| 10:00 AM IRST | 6:30 AM GMT | — |
| 11:00 AM IRST | 7:30 AM GMT | — |
| 12:00 PM IRST | 8:30 AM GMT | — |
| 1:00 PM IRST | 9:30 AM GMT | work hours |
| 2:00 PM IRST | 10:30 AM GMT | work hours |
| 3:00 PM IRST | 11:30 AM GMT | work hours |
| 4:00 PM IRST | 12:30 PM GMT | work hours |
| 5:00 PM IRST | 1:30 PM GMT | — |
| 6:00 PM IRST | 2:30 PM GMT | — |
| 7:00 PM IRST | 3:30 PM GMT | — |
| 8:00 PM IRST | 4:30 PM GMT | — |
| 9:00 PM IRST | 5:30 PM GMT | — |
| 10:00 PM IRST | 6:30 PM GMT | — |
| 11:00 PM IRST | 7:30 PM GMT | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert Tehran Time to GMT
Subtract 3 hours 30 minutes from the Tehran Time time to get GMT.
Example: 9:00 AM IRST = 5:30 AM GMT.
Across midnight: 1:00 AM IRST = 9:30 PM GMT (previous day). The date changes, so always check the day as well as the hour.
Time difference between Tehran Time and GMT
The time difference between Tehran Time and GMT is 3 hours 30 minutes all year – GMT is behind IRST.
Tehran Time and GMT during daylight saving time
- Tehran Time does not observe daylight saving time; it stays on UTC+3:30 all year.
- GMT does not observe daylight saving time; it stays on UTC+0 all year.
Best time for a meeting between Tehran Time and GMT
Tehran Time and GMT share 4 hours 30 minutes of the 9 AM–5 PM working day. Any time between 12:30 PM and 5:00 PM IRST lands between 9:00 AM and 1:30 PM GMT, inside working hours for both.
Tehran Time to GMT FAQ
What is the time difference between Tehran Time and GMT?
GMT is 3 hours 30 minutes behind IRST all year. 9:00 AM IRST = 5:30 AM GMT.
What is 9 AM Tehran Time in GMT?
9:00 AM IRST is 5:30 AM GMT.
What is 12 PM (noon) Tehran Time in GMT?
12:00 PM IRST is 8:30 AM GMT.
Is GMT ahead of or behind Tehran Time?
GMT is 3 hours 30 minutes behind IRST, so it is earlier in GMT than in Tehran Time.
Does Tehran Time change for daylight saving time?
No. Tehran Time stays on the same offset all year, so conversions never shift for daylight saving time.
Does GMT change for daylight saving time?
No. GMT stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between Tehran Time and GMT?
Tehran Time and GMT share 4 hours 30 minutes of the 9 AM–5 PM working day. Any time between 12:30 PM and 5:00 PM IRST lands between 9:00 AM and 1:30 PM GMT, inside working hours for both.
Related conversions
Convert GMT to Tehran Time
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Learn more
Updated 7 November 2026. Time zone data: IANA tz database.