What is the time difference between London and Tehran?

Tehran is 2 hours 30 minutes ahead of London. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Tehran from London?

Between 09:00–15:30 in London, which is 11:30–18:00 in Tehran. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does London observe daylight saving time?

Yes. London runs on UTC+0 in winter and UTC+1 in summer. The next change is on 2026-10-25, when clocks go back by 60 minutes.

Does Tehran observe daylight saving time?

No. Tehran stays on UTC+3:30 all year, so its clocks never move.

If it is midday in London, what time is it in Tehran?

It is 14:30 in Tehran, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do London and Tehran use?

London uses Europe/London, currently UTC+1 (BST), and Tehran uses Asia/Tehran, currently UTC+3:30. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert London time to Tehran time

Tehran is 2 hours 30 minutes ahead of London right now, so midday in London lands in the afternoon in Tehran.

Convert a time

From

Date

Time

Converted time

—

The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

Every hour of a day in London, and what the clock reads in Tehran at that same moment.

London	Tehran
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
08:00	10:30
09:00	11:30
10:00	12:30
11:00	13:30
12:00	14:30
13:00	15:30
14:00	16:30
15:00	17:30
16:00	18:30
17:00	19:30
18:00	20:30
19:00	21:30
20:00	22:30
21:00	23:30
22:00	00:30next day
23:00	01:30next day

Daylight saving time

Tehran keeps one offset all year while London moves twice. That is the whole reason this difference is seasonal.

London

Observes daylight saving time

Standard: UTC+0
Daylight: UTC+1
Next change: 2026-10-25 −60m

Tehran

Does not observe daylight saving time

Standard: UTC+3:30

When you can actually talk

The window is 6 hours 30 minutes wide — 09:00–15:30 in London, 11:30–18:00 in Tehran.

London 09:00–15:30Tehran 11:30–18:00

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

	London	Tehran
IANA zone	Europe/London	Asia/Tehran
Abbreviation	BST	UTC+3:30
Standard offset	UTC+0	UTC+3:30
Daylight offset	UTC+1	—
Clock changes this year	2	0
Country	United Kingdom	Iran

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between London and Tehran?: Tehran is 2 hours 30 minutes ahead of London. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Tehran from London?: Between 09:00–15:30 in London, which is 11:30–18:00 in Tehran. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does London observe daylight saving time?: Yes. London runs on UTC+0 in winter and UTC+1 in summer. The next change is on 2026-10-25, when clocks go back by 60 minutes.
Does Tehran observe daylight saving time?: No. Tehran stays on UTC+3:30 all year, so its clocks never move.
If it is midday in London, what time is it in Tehran?: It is 14:30 in Tehran, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do London and Tehran use?: London uses Europe/London, currently UTC+1 (BST), and Tehran uses Asia/Tehran, currently UTC+3:30. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.