GMT to IRST converter

Greenwich Mean Time (the same as UTC, all year) to Iran Time (Tehran).

GMT12:07 AMSat 31 Oct 2026

→

IRST3:37 AMSat 31 Oct 2026

IRST is 3 h 30 min ahead of GMT.

Pick a time in GMT

⇄ IRST to GMT

9:00 AM GMT = 12:30 PM IRST same day

Best time to meet

The best time to meet is between 9:00 AM and 2:00 PM GMT, which is 12:30 PM to 5:30 PM IRST. Both sides are then inside 9 AM to 5 PM.

GMT to IRST time table

For 31 Oct 2026. Green rows: both sides between 9 AM and 5 PM.

GMT	IRST
12:00 AM GMT	3:30 AM IRST
1:00 AM GMT	4:30 AM IRST
2:00 AM GMT	5:30 AM IRST
3:00 AM GMT	6:30 AM IRST
4:00 AM GMT	7:30 AM IRST
5:00 AM GMT	8:30 AM IRST
6:00 AM GMT	9:30 AM IRST
7:00 AM GMT	10:30 AM IRST
8:00 AM GMT	11:30 AM IRST
9:00 AM GMT	12:30 PM IRST
10:00 AM GMT	1:30 PM IRST
11:00 AM GMT	2:30 PM IRST
12:00 PM GMT	3:30 PM IRST
1:00 PM GMT	4:30 PM IRST
2:00 PM GMT	5:30 PM IRST
3:00 PM GMT	6:30 PM IRST
4:00 PM GMT	7:30 PM IRST
5:00 PM GMT	8:30 PM IRST
6:00 PM GMT	9:30 PM IRST
7:00 PM GMT	10:30 PM IRST
8:00 PM GMT	11:30 PM IRST
9:00 PM GMT	12:30 AM IRST next day
10:00 PM GMT	1:30 AM IRST next day
11:00 PM GMT	2:30 AM IRST next day

Quick answers

9:00 AM GMT = 12:30 PM IRST
12:00 PM GMT = 3:30 PM IRST
3:00 PM GMT = 6:30 PM IRST
5:00 PM GMT = 8:30 PM IRST
9:00 AM IRST = 5:30 AM GMT
12:00 PM IRST = 8:30 AM GMT
5:00 PM IRST = 1:30 PM GMT

Does the gap change during the year?

No. IRST is 3 h 30 min ahead of GMT all year.

GMT does not change its clocks. IRST does not change its clocks.

About GMT and IRST

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.

IRST here means Iran Time, the clock in Tehran. Right now it is UTC+3:30. It has no daylight saving.

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