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