Watch the transition weeks
London afternoons can line up with New York mornings. The US and UK change clocks on different dates, so the familiar difference can briefly shift. Review each occurrence around March and late October rather than copying a winter conversion into a recurring invitation.
London, GB: Europe/London (city ID: london).
New York, US: America/New_York (city ID: new-york).
Does the difference change?
The destination-minus-source differences sampled on the 15th of each month in 2027 are −5h, −4h. These are dated examples, not a promise of fixed offsets or a complete historical range. A different reference date may have different rules.
| Source date | London | New York |
|---|---|---|
| 2027-01-16 | 10:00 Greenwich Mean Time | 2027-01-16 · 05:00 Same day · Eastern Standard Time |
| 2027-07-16 | 10:00 British Summer Time | 2027-07-16 · 05:00 Same day · Eastern Daylight Time |
Daylight-saving rules depend on the city and date. When a local hour is missing or repeated, the converter rejects it or asks which occurrence you mean. Rules can change politically; reconfirm far-future meetings.