London is 8 hours ahead of Los Angeles most of the year, and 7 hours from mid-March to late March and from late October to early November.
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Quick reference
| LONDON | LOS ANGELES · MOST OF THE YEAR | LOS ANGELES · MID-MAR–LATE MAR, LATE OCT–EARLY NOV |
|---|---|---|
| 9:00 am | 1:00 am | 2:00 am |
| 12:00 pm | 4:00 am | 5:00 am |
| 3:00 pm | 7:00 am | 8:00 am |
| 6:00 pm | 10:00 am | 11:00 am |
| 9:00 pm | 1:00 pm | 2:00 pm |
Questions
8 hours most of the year, and 7 hours from mid-March to late March and from late October to early November, when London and Los Angeles change their clocks on different dates.
1am most of the year, and 2am from mid-March to late March and from late October to early November.
Yes, both, on different dates. London moves to BST (UTC+1) in late March and back to GMT (UTC+0) in late October; Los Angeles moves to PDT (UTC-7) in mid-March and back to PST (UTC-8) in early November.