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San Francisco to London Time Converter

London is usually 8 hours ahead of San Francisco, so 9:00 AM in San Francisco is normally 5:00 PM in London. For a few weeks each year the gap is 7 hours instead, because the US and the UK change their clocks on different dates.

PDT · UTC−7
Mon, Oct 19
BST · UTC+1
Mon, Oct 19

On Monday, October 19, London is 8 hours ahead of San Francisco.

Heads-up: clocks in London go back on Sunday, October 25. After that, London is 7 hours ahead of San Francisco.

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Time zone rules checked October 2026. The converter runs on your device using its built-in time zone database, so it accounts for daylight saving time on any date you pick.

San Francisco and London, hour by hour

Green rows are the hours when both cities are inside an ordinary 9-to-5 working day. Change the date in the converter and this table follows it.

Hour by hour for Monday, October 19, 2026 in San Francisco
San Francisco PDTLondon BSTOffice hours (9 AM to 5 PM, local weekdays)
12:00 AM8:00 AM
1:00 AM9:00 AMLondon only
2:00 AM10:00 AMLondon only
3:00 AM11:00 AMLondon only
4:00 AM12:00 PMLondon only
5:00 AM1:00 PMLondon only
6:00 AM2:00 PMLondon only
7:00 AM3:00 PMLondon only
8:00 AM4:00 PMLondon only
9:00 AM5:00 PMSan Francisco only
10:00 AM6:00 PMSan Francisco only
11:00 AM7:00 PMSan Francisco only
12:00 PM8:00 PMSan Francisco only
1:00 PM9:00 PMSan Francisco only
2:00 PM10:00 PMSan Francisco only
3:00 PM11:00 PMSan Francisco only
4:00 PM12:00 AM next daySan Francisco only
5:00 PM1:00 AM next day
6:00 PM2:00 AM next day
7:00 PM3:00 AM next day
8:00 PM4:00 AM next day
9:00 PM5:00 AM next day
10:00 PM6:00 AM next day
11:00 PM7:00 AM next day

The best time for a call

A 9-to-5 day in San Francisco and one in London don’t overlap at all, so somebody has to stretch. The fairest one-hour slot is usually 8:30 AM in San Francisco, which is 4:30 PM in London. It asks San Francisco to start about half an hour early and London to stay about half an hour late.

When the gap is 7 hours, a short overlap opens up: 9:00 AM to 10:00 AM in San Francisco.

San Francisco shares Pacific Time with Los Angeles and Seattle, so the arithmetic is identical: an eight-hour gap most of the year and no overlap at all between two ordinary office days. Bay Area teams with London colleagues usually hold the standup at 8 or 8:30 a.m. Pacific.

The slot to avoid is Friday. Eight o’clock on a Friday morning in San Francisco is 4 p.m. on a Friday in London, when the office there is already thinning out.

Plan a meeting with San Francisco, London and other cities →

Why the time difference changes

Both cities use daylight saving time, but they don’t switch on the same weekend. In the US, clocks go forward on the second Sunday in March and back on the first Sunday in November. In the UK, clocks go forward on the last Sunday in March and back on the last Sunday in October. In the weeks between the two changes, one city has moved its clocks and the other hasn’t, so the difference is an hour off its usual figure.

This catches people out every year, mostly with recurring meetings. Calendar apps keep a recurring event at the organiser’s local time, so for those few weeks it lands an hour earlier or later for everyone else.

London compared with San Francisco, Oct 19, 2026 to Oct 19, 2027
FromUntilLondon is9:00 AM in San Francisco is
TodayOct 25, 20268 hours ahead5:00 PM BST
Oct 25, 2026Nov 1, 20267 hours ahead4:00 PM GMT
Nov 1, 2026Mar 14, 20278 hours ahead5:00 PM GMT
Mar 14, 2027Mar 28, 20277 hours ahead4:00 PM GMT
Mar 28, 2027—8 hours ahead5:00 PM BST

The two time zones

San Francisco

Time zone
Pacific Time (PST / PDT)
UTC offset
UTC−8, or UTC−7 in summer
Daylight saving
Clocks go forward on the second Sunday in March and back on the first Sunday in November.
Next change
Nov 1, 2026 (clocks go back)
IANA zone
America/Los_Angeles

London

Time zone
UK time (GMT / BST)
UTC offset
UTC+0, or UTC+1 in summer
Daylight saving
Clocks go forward on the last Sunday in March and back on the last Sunday in October.
Next change
Oct 25, 2026 (clocks go back)
IANA zone
Europe/London

Common questions

What time is it in London when it’s 9 AM in San Francisco?

Usually 5:00 PM. During the few weeks when the clocks are out of step it’s 4:00 PM. The converter at the top of this page applies the right rule for whatever date you choose.

Is London always 8 hours ahead of San Francisco?

No. Over the next twelve months it’s 8 hours most of the time, but it changes for a few weeks: Oct 25 until Nov 1, 2026 (7 hours) and Mar 14 until Mar 28, 2027 (7 hours). That’s down to daylight saving time, explained above.

What’s a good time for a meeting between San Francisco and London?

A 9-to-5 day in San Francisco and one in London don’t overlap at all, so somebody has to stretch. The fairest one-hour slot is usually 8:30 AM in San Francisco, which is 4:30 PM in London. It asks San Francisco to start about half an hour early and London to stay about half an hour late.

Is London a day ahead of San Francisco?

For part of the day, yes. On a typical day, from about 4:00 PM in San Francisco onwards it’s already the next day in London. The converter and hour-by-hour table flag this with a “next day” label.

Need more than two cities? The World Time Grid lines up to five locations side by side, so you can see everyone’s day at once.

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