Why is London always 8 hours ahead of Los Angeles?
London runs 8 hours ahead of Los Angeles every day of the year. Not 7, not 9. The gap holds through both DST transitions because Pacific Time and UK time shift together: PST (UTC−8) to GMT (UTC+0) is 8 hours, and PDT (UTC−7) to BST (UTC+1) is also 8 hours. Both regions spring forward and fall back by one hour, so the offset never changes.
The US and UK change clocks on different Sundays. In 2026 the US springs forward on 8 March, the UK on 29 March. The US falls back on 1 November, the UK on 25 October. During those two three-week windows the gap shrinks to 7 hours. For the other 46 weeks, it is 8.
Bottom line: London is 8 hours ahead of Los Angeles, San Francisco, Seattle, Vancouver, and Tijuana.
What is the time difference from PST to GMT and PDT to BST?
PST to GMT (winter)
From the first Sunday in November until the second Sunday in March, Pacific Time runs on PST (UTC−8) and the UK runs on GMT (UTC+0). 09:00 in Los Angeles is 17:00 in London.
PDT to BST (summer)
From the second Sunday in March until the first Sunday in November, Pacific Time runs on PDT (UTC−7) and the UK runs on BST (UTC+1). 09:00 in Los Angeles is still 17:00 in London.
DST transition overlap
The mismatched weeks catch people off guard. In 2026:
- 8 March to 29 March: The US is on PDT, the UK is still on GMT. Difference: 7 hours.
- 25 October to 1 November: The UK is on GMT, the US is still on PDT. Difference: 7 hours.
Check your calendar during those windows. Most scheduling software adjusts automatically if you set the event time zone to America/Los_Angeles and Europe/London.
Quick-reference conversion table
| Pacific Time (PT) | UK Time (GMT/BST) |
|---|---|
| 00:00 (midnight) | 08:00 |
| 03:00 | 11:00 |
| 06:00 | 14:00 |
| 09:00 | 17:00 |
| 12:00 (noon) | 20:00 |
| 15:00 | 23:00 |
| 18:00 | 02:00 (next day) |
| 21:00 | 05:00 (next day) |
Add 8 hours to convert Pacific to UK (7 during the transition periods above). Subtract 8 hours to go the other way.
When should I call London from the West Coast?
London office hours run roughly 09:00 to 17:30 GMT/BST. Converted to Pacific Time:
- London 09:00 → Pacific 01:00
- London 13:00 → Pacific 05:00
- London 15:00 → Pacific 07:00
- London 17:00 → Pacific 09:00
- London 18:00 → Pacific 10:00
The sweet spot is Pacific 08:00 to 10:00, which hits London 16:00 to 18:00. Late afternoon in the UK, before people leave. For East Coast callers the window is wider: see the Pacific Time to Eastern Time guide.
Why do West Coast to Europe redeyes hit so hard?
West Coast to Europe redeye flights depart between 18:00 and 22:00 PT and land in European morning. A Los Angeles to London flight runs about 10 hours. Depart at 20:00 PT and you arrive around 06:00 local the next day. You lose a full night.
Eastbound jet lag is worse than westbound. Flying to Europe means losing hours against the clock; flying home means gaining them. Plan for several days of adjustment. The Pacific Time Travel Guide covers strategies.