What is the time difference between San Francisco and London?

London is 8 hours ahead of San Francisco. 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 London from San Francisco?

Between 09:00–10:00 in San Francisco, which is 17:00–18:00 in London. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does San Francisco observe daylight saving time?

Yes. San Francisco runs on UTC-8 in winter and UTC-7 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.

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.

If it is midday in San Francisco, what time is it in London?

It is 20:00 in London, 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 San Francisco and London use?

San Francisco uses America/Los_Angeles, currently UTC-7 (PDT), and London uses Europe/London, currently UTC+1 (BST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert San Francisco time to London time

Right now London runs 8 hours ahead of San Francisco. That gap is not fixed: it moves when either city changes its clocks.

Convert a time

From

Date

Time

Converted time

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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

The whole day mapped across: read down the left for San Francisco, across for London.

San Francisco	London
00:00	08:00
01:00	09:00
02:00	10:00
03:00	11:00
04:00	12:00
05:00	13:00
06:00	14:00
07:00	15:00
08:00	16:00
09:00	17:00
10:00	18:00
11:00	19:00
12:00	20:00
13:00	21:00
14:00	22:00
15:00	23:00
16:00	00:00next day
17:00	01:00next day
18:00	02:00next day
19:00	03:00next day
20:00	04:00next day
21:00	05:00next day
22:00	06:00next day
23:00	07:00next day

Daylight saving time

Both cities change their clocks, but not necessarily on the same date — which is why the difference between them shifts for a few weeks each year.

San Francisco

Observes daylight saving time

Standard: UTC-8
Daylight: UTC-7
Next change: 2026-11-01 −60m

London

Observes daylight saving time

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

When you can actually talk

You have 1 hour of shared working time: 09:00–10:00 in San Francisco, which is 17:00–18:00 in London.

San Francisco 09:00–10:00London 17:00–18:00

Reference

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

	San Francisco	London
IANA zone	America/Los_Angeles	Europe/London
Abbreviation	PDT	BST
Standard offset	UTC-8	UTC+0
Daylight offset	UTC-7	UTC+1
Clock changes this year	2	2
Country	United States	United Kingdom

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

Common questions

What is the time difference between San Francisco and London?: London is 8 hours ahead of San Francisco. 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 London from San Francisco?: Between 09:00–10:00 in San Francisco, which is 17:00–18:00 in London. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does San Francisco observe daylight saving time?: Yes. San Francisco runs on UTC-8 in winter and UTC-7 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.
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.
If it is midday in San Francisco, what time is it in London?: It is 20:00 in London, 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 San Francisco and London use?: San Francisco uses America/Los_Angeles, currently UTC-7 (PDT), and London uses Europe/London, currently UTC+1 (BST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.