MeanwhileIRST to GMT converter
Iran Time (Tehran) to Greenwich Mean Time (the same as UTC, all year).
GMT is 3 h 30 min behind IRST.
9:00 AM IRST = 5:30 AM GMT same day
Best time to meet
The best time to meet is between 1:00 PM and 5:00 PM IRST, which is 9:30 AM to 1:30 PM GMT. Both sides are then inside 9 AM to 5 PM.
IRST to GMT time table
For 31 Oct 2026. Green rows: both sides between 9 AM and 5 PM.
| IRST | GMT |
|---|---|
| 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 |
| 5:00 AM IRST | 1:30 AM GMT |
| 6:00 AM IRST | 2:30 AM GMT |
| 7:00 AM IRST | 3:30 AM GMT |
| 8:00 AM IRST | 4:30 AM GMT |
| 9:00 AM IRST | 5:30 AM GMT |
| 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 |
| 2:00 PM IRST | 10:30 AM GMT |
| 3:00 PM IRST | 11:30 AM GMT |
| 4:00 PM IRST | 12:30 PM GMT |
| 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 |
Quick answers
- 9:00 AM IRST = 5:30 AM GMT
- 12:00 PM IRST = 8:30 AM GMT
- 3:00 PM IRST = 11:30 AM GMT
- 5:00 PM IRST = 1:30 PM GMT
- 9:00 AM GMT = 12:30 PM IRST
- 12:00 PM GMT = 3:30 PM IRST
- 5:00 PM GMT = 8:30 PM IRST
Does the gap change during the year?
No. GMT is 3 h 30 min behind IRST all year.
IRST does not change its clocks. GMT does not change its clocks.
About IRST and GMT
IRST here means Iran Time, the clock in Tehran. Right now it is UTC+3:30. It has no daylight saving.
GMT here means Greenwich Mean Time, the clock in the same as UTC, all year. Right now it is UTC+0. It has no daylight saving.
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