London is 5 hours ahead of New York most of the year, and 4 hours from mid-March to late March and from late October to early November.
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Quick reference
| LONDON | NEW YORK · MOST OF THE YEAR | NEW YORK · MID-MAR–LATE MAR, LATE OCT–EARLY NOV |
|---|---|---|
| 9:00 am | 4:00 am | 5:00 am |
| 12:00 pm | 7:00 am | 8:00 am |
| 3:00 pm | 10:00 am | 11:00 am |
| 6:00 pm | 1:00 pm | 2:00 pm |
| 9:00 pm | 4:00 pm | 5:00 pm |
Questions
5 hours most of the year, and 4 hours from mid-March to late March and from late October to early November, when London and New York change their clocks on different dates.
4am most of the year, and 5am 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; New York moves to EDT (UTC-4) in mid-March and back to EST (UTC-5) in early November.