San Francisco to London Time Converter
Live overlap scrubber for scheduling meetings between San Francisco, United States and London, United Kingdom.
San Francisco vs London Overlap
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San Francisco
PDTThu, Sep 24
•London
GMT+1Thu, Sep 24
•The Time Gap Between San Francisco and London
San Francisco runs at UTC-8 in January and UTC-7 in July, shifting its clocks for Daylight Saving Time.
London runs at UTC+0 in January and UTC+1 in July, shifting its clocks for Daylight Saving Time.
Because the two zones don't shift their clocks on identical dates, the gap between them isn't fixed: it's 8 hours most of the year, but for about 28 days — while one side has changed its clocks and the other hasn't yet — it briefly runs at 7 hours instead. That short window is a common cause of a recurring meeting quietly moving by an hour without anyone changing the invite.
Realistic Overlap for a Standard 9-to-5
Assuming a standard 9am–5pm workday on both ends, San Francisco and London share about 0–1 hours of true overlap. That's a narrow window, tight enough that it's worth protecting deliberately (a fixed daily or twice-weekly slot) rather than assuming it'll happen organically.
- Most of the year: the one-hour slot that splits the inconvenience most evenly is 8:30am in San Francisco = 4:30pm in London.
2026 Clock Changes for San Francisco and London
These are the dates in 2026 when the gap between the two cities changes. Around each one, check that recurring invites still land where you expect — calendar apps anchor a meeting to its organizer's time zone, so it's the other side's local time that moves.
- Jan 1 — London is 8 hours ahead of San Francisco.
- Mar 8 — San Francisco springs forward to UTC-7, so London is now 7 hours ahead of San Francisco.
- Mar 29 — London springs forward to UTC+1, so London is now 8 hours ahead of San Francisco.
- Oct 25 — London falls back to UTC+0, so London is now 7 hours ahead of San Francisco.
- Nov 1 — San Francisco falls back to UTC-8, so London is now 8 hours ahead of San Francisco.
Hour-by-Hour: San Francisco to London
San Francisco's day from 7am to 10pm, with the matching time in London. Green is a standard 9-to-5, amber is the early-morning or evening fringe, and grey is when people are usually asleep.
| San Francisco | London |
|---|---|
| 7:00am | 3:00pm (work) |
| 8:00am | 4:00pm (work) |
| 9:00am | 5:00pm (fringe) |
| 10:00am | 6:00pm (fringe) |
| 11:00am | 7:00pm (fringe) |
| 12:00pm | 8:00pm (fringe) |
| 1:00pm | 9:00pm (asleep) |
| 2:00pm | 10:00pm (asleep) |
| 3:00pm | 11:00pm (asleep) |
| 4:00pm | 12:00am +1 day (asleep) |
| 5:00pm | 1:00am +1 day (asleep) |
| 6:00pm | 2:00am +1 day (asleep) |
| 7:00pm | 3:00am +1 day (asleep) |
| 8:00pm | 4:00am +1 day (asleep) |
| 9:00pm | 5:00am +1 day (asleep) |
| 10:00pm | 6:00am +1 day (asleep) |
PST to GMT: What the Abbreviations Mean
PST — Pacific Standard Time (PST, UTC-8) runs part of the year; the rest of the year the same clocks are on Pacific Daylight Time (PDT, UTC-7) instead. People casually say "PST" for both — the scrubber above already resolves whichever one is actually in effect for the date you pick.
GMT — Greenwich Mean Time (GMT, UTC+0) runs part of the year; the rest of the year the same clocks are on British Summer Time (BST, UTC+1) instead. People casually say "GMT" for both — the scrubber above already resolves whichever one is actually in effect for the date you pick.
Timezone abbreviations aren't globally unique — several regions reuse the same three or four letters for unrelated zones. The scrubber is anchored to IANA timezone data (America/Los_Angeles and Europe/London) rather than the abbreviation text, so there's no ambiguity in the actual conversion.