London and New York are two of the world’s largest financial centers. Trading desks, investment banks, and law firms with transatlantic operations convert between these zones dozens of times a day.
When both cities are in standard time (late November through mid-March), London (GMT, UTC+0) is 5 hours ahead of New York (EST, UTC−5). A 2 PM meeting in London falls at 9 AM in New York.
The complexity arises because the UK and the US switch to daylight saving on different dates. The US springs forward in mid-March, but the UK does not follow until late March. During those two to three weeks, the gap temporarily narrows to 4 hours. A similar mismatch happens in autumn when the UK falls back in late October, but the US waits until early November.
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