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
| NEW YORK | LONDON · MOST OF THE YEAR | LONDON · MID-MAR–LATE MAR, LATE OCT–EARLY NOV |
|---|---|---|
| 9:00 am | 2:00 pm | 1:00 pm |
| 12:00 pm | 5:00 pm | 4:00 pm |
| 3:00 pm | 8:00 pm | 7:00 pm |
| 6:00 pm | 11:00 pm | 10:00 pm |
| 9:00 pm | 2:00 am next day | 1:00 am next day |
Questions
5 hours most of the year, and 4 hours from mid-March to late March and from late October to early November, when New York and London change their clocks on different dates.
2pm most of the year, and 1pm from mid-March to late March and from late October to early November.
Yes, both, on different dates. New York moves to EDT (UTC-4) in mid-March and back to EST (UTC-5) in early November; London moves to BST (UTC+1) in late March and back to GMT (UTC+0) in late October.