What is the time difference between London and San Francisco?

San Francisco is 8 hours behind 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 San Francisco from London?

Between 17:00–18:00 in London, which is 09:00–10:00 in San Francisco. 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 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.

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

It is 04:00 in San Francisco, 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 San Francisco use?

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

Convert London time to San Francisco time

Right now San Francisco runs 8 hours behind London. 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

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

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

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.

London

Observes daylight saving time

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

San Francisco

Observes daylight saving time

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

When you can actually talk

The window is 1 hour wide — 17:00–18:00 in London, 09:00–10:00 in San Francisco.

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

Reference

The zone identifiers and offsets behind everything above.

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

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

Common questions

What is the time difference between London and San Francisco?: San Francisco is 8 hours behind 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 San Francisco from London?: Between 17:00–18:00 in London, which is 09:00–10:00 in San Francisco. 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 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.
If it is midday in London, what time is it in San Francisco?: It is 04:00 in San Francisco, 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 San Francisco use?: London uses Europe/London, currently UTC+1 (BST), and San Francisco uses America/Los_Angeles, currently UTC-7 (PDT). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.