Time difference · Europe/London ↔ Asia/Tehran
Time difference between London and Tehran
In short
Tehran is 2 hours 30 minutes ahead of London for 217 of the next 365 days.
From 1 November 2026 to 27 March 2027 the difference is 3 hours 30 minutes.
When it is 09:00 in London, it is 11:30 in Tehran.
Computed from IANA tzdb 2026e UTC offsets for Europe/London and Asia/Tehran.
Data updated
Right now
- London
- --:--
- Tehran
- --:--
Current local times appear here.
Usual difference
+2 h 30 min
Tehran ahead, 217 of the next 365 days
Through the year
+2 h 30 min to +3 h 30 min
Tehran relative to London
Working hours overlap
5 h 30 minutes
09:00–14:30 in London
Straight-line distance
4,399 km
2,734 mi between city centres
How the difference changes over the next 12 months
Positive values mean Tehran is ahead of London.
| From | Until | Tehran vs London |
|---|---|---|
| 1 Nov 2026 | 28 Mar 2027 | +3 h 30 minchanged |
| 28 Mar 2027 | 31 Oct 2027 | +2 h 30 min |
| 31 Oct 2027 | 31 Oct 2027 | +3 h 30 minchanged |
Dates are UTC days; clocks change at local times listed below.
When the clocks change
London
Europe/London
Sun, 28 March 2027
At 01:00 clocks go forward 1 hour to 02:00 (BST, UTC+01:00)
Sun, 31 October 2027
At 02:00 clocks go back 1 hour to 01:00 (GMT, UTC+00:00)
Tehran
Asia/Tehran
No clock changes in this period.
Hour by hour (+2 h 30 min)
At the usual difference. Arrival time = departure time in London + flight time + 2 hours 30 minutes. On dates with a different gap, shift every row by the change.
| London | Tehran | Both awake / working |
|---|---|---|
| 00:00 | 02:30 | — |
| 01:00 | 03:30 | — |
| 02:00 | 04:30 | — |
| 03:00 | 05:30 | — |
| 04:00 | 06:30 | — |
| 05:00 | 07:30 | — |
| 06:00 | 08:30 | — |
| 07:00 | 09:30 | both awake |
| 08:00 | 10:30 | both awake |
| 09:00 | 11:30 | working hours |
| 10:00 | 12:30 | working hours |
| 11:00 | 13:30 | working hours |
| 12:00 | 14:30 | working hours |
| 13:00 | 15:30 | working hours |
| 14:00 | 16:30 | working hours |
| 15:00 | 17:30 | both awake |
| 16:00 | 18:30 | both awake |
| 17:00 | 19:30 | both awake |
| 18:00 | 20:30 | both awake |
| 19:00 | 21:30 | both awake |
| 20:00 | 22:30 | both awake |
| 21:00 | 23:30 | — |
| 22:00 | 00:30next day | — |
| 23:00 | 01:30next day | — |
Calling and meeting windows
| Difference | Days | Both awake (07–23), London time | Both working (09–17), London time |
|---|---|---|---|
| +2 h 30 min | 217 | 07:00–20:30 | 09:00–14:30 |
| +3 h 30 min | 148 | 07:00–19:30 | 09:00–13:30 |
What the data shows
Over the next 12 months the gap is 2 hours 30 minutes for 217 days, 3 hours 30 minutes for 148 days, because only London changes its clocks.
How we calculated this: Days per distinct difference across the period.
At the usual difference, 09:00–17:00 working days overlap for 5 hours 30 minutes: 09:00–14:30 in London, 11:30–17:00 in Tehran.
How we calculated this: Intersection of 09:00–17:00 local in both places at the typical difference.
The difference is not a whole number of hours because Tehran keeps a UTC offset with 30 extra minutes.
How we calculated this: Non-integer-hour UTC offset in tzdb.
This page also answers for
These places keep exactly the same clocks over the period, so every number above applies to them too.
Same clock as London
- Lisbon, Portugal
- Dublin, Ireland
- Las Palmas, Spain
- Birmingham, United Kingdom
- Manchester, United Kingdom
- Leeds, United Kingdom
- Porto, Portugal
- Sheffield, United Kingdom
Same clock as Tehran
- Mashhad, Iran
- Isfahan, Iran
- Karaj, Iran
- Tabriz, Iran
- Shiraz, Iran
- Ahvaz, Iran
- Qom, Iran
- Kermanshah, Iran
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