BST to IRST converter

UK Time (London, Dublin, Lisbon) to Iran Time (Tehran).

BST12:07 AMSat 31 Oct 2026

→

IRST3:37 AMSat 31 Oct 2026

IRST is 3 h 30 min ahead of BST.

Pick a time in BST

⇄ IRST to BST

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

Best time to meet

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

BST to IRST time table

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

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

Quick answers

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

Does the gap change during the year?

Yes, because of daylight saving. Until 28 Mar 2027: IRST is 3 h 30 min ahead of BST. From 28 Mar 2027 to 31 Oct 2027: IRST is 2 h 30 min ahead of BST. From 31 Oct 2027 to 26 Mar 2028: IRST is 3 h 30 min ahead of BST.

BST next changes its clocks on 28 Mar 2027 (forward 1 h, to UTC+1), then on 31 Oct 2027 (back 1 h, to UTC+0). IRST does not change its clocks.

About BST and IRST

BST here means UK Time, the clock in London, Dublin, Lisbon. Right now it is UTC+0. In winter the same clock is called GMT. This page follows the real clock all year.

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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