Seoul is 8 hours ahead of London from late March to late October, and 9 hours the rest of the year.
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Quick reference
| SEOUL | LONDON · LATE MAR–LATE OCT | LONDON · REST OF YEAR |
|---|---|---|
| 9:00 am | 1:00 am | 12:00 am |
| 12:00 pm | 4:00 am | 3:00 am |
| 3:00 pm | 7:00 am | 6:00 am |
| 6:00 pm | 10:00 am | 9:00 am |
| 9:00 pm | 1:00 pm | 12:00 pm |
Questions
8 hours from late March to late October, while London is on British Summer Time (BST). 9 hours the rest of the year, while London is on Greenwich Mean Time (GMT).
1am from late March to late October, and 12am the rest of the year.
Only London. It moves to BST (UTC+1) in late March and back to GMT (UTC+0) in late October. Seoul stays on Korea Standard Time (KST, UTC+9) all year.