Time Difference Between London and New York

London and New York are the two poles of the global finance workday, and the five-hour gap between them is arguably the most scheduled-around time difference on earth. It works asymmetrically. London's afternoon lands in New York's morning, so 2 PM to 6 PM London (9 AM to 1 PM in New York) is the corridor where most transatlantic meetings actually happen. The reverse never works: by the time New York reaches its own afternoon, London has gone home. If you are on the New York side waiting on a London reply, send before your own lunch or expect to wait a day.

Twice a year the gap quietly shrinks to four hours, because the United States changes its clocks about three weeks before Europe in spring and one week after it in autumn. The exact dates are in the table above. Those mismatch weeks are when standing meetings silently shift an hour and someone joins a call to an empty room; recurring calendar events created in one city's time zone will hold that city's local hour and move for everyone else.

For travelers, the eastbound red-eye from New York (about 7 hours in the air) compresses the night brutally: leave at 8 PM, land at 8 AM London time with your body insisting it is 3 AM. Flying west is gentler, since the day simply stretches, and many people land in New York feeling merely tired rather than wrecked. Seasoned commuters on this route protect the first morning after an eastbound flight and schedule nothing important before noon; the ones who book a 9 AM meeting at Canary Wharf off the red-eye tend to do it exactly once.