The hours you are both awake, a good time to ring, and how the gap moves through the year. Worked out from the time-zone database.
Right now
Choose both places to see the hours.
Waking hours
We assume people are up from 7:00 to 22:00, and that 9:00 to 21:00 is a fair time for a call. Change it if they keep other hours.
About this pair
Iran no longer changes its clocks, so the gap with London moves only with the UK’s changes in March and October. If a time website shows Iran on summer time, it is out of date.
A call in your morning reaches them around lunchtime. Your evening is late at night in Tehran.
Written by The Sunli team.
Through the year
We assume you are up from 7:00 to 22:00 and that 9:00 to 21:00 is a fair time for them to take a call. Change the hours in the tool above if they keep others.
14 November 2026 to 28 March 2027
Tehran is 3 hours and 30 minutes ahead of London.
Good time to ring: 7:00 to 17:30, your time (10:30 to 21:00 in Tehran).
28 March 2027 to 31 October 2027
Tehran is 2 hours and 30 minutes ahead of London.
Good time to ring: 7:00 to 18:30, your time (9:30 to 21:00 in Tehran).
31 October 2027 to 31 December 2027
Tehran is 3 hours and 30 minutes ahead of London.
Good time to ring: 7:00 to 17:30, your time (10:30 to 21:00 in Tehran).
When the clocks change
London: clocks go forward 1 hour on Sunday 28 March 2027, at 1:00 local time.
London: clocks go back 1 hour on Sunday 31 October 2027, at 2:00 local time.
Tehran does not change its clocks in this period.
Tehran last changed its clocks on 22 September 2022.
Time zones: London uses Europe/London and Tehran uses Asia/Tehran in the IANA time-zone database, version 2026f. Dates are worked out from it; a government can change its clocks at short notice.
