London vs New York: How Many Hours Apart Are They Really?

People often assume London is always five hours ahead of New York, but that isn’t true every week of the year. The real answer depends on when each region changes its clocks for daylight saving time.

The Standard Five-Hour Difference

In winter, London operates on GMT (UTC+0) while New York uses EST (UTC-5), creating a clean five-hour difference. This same five-hour gap returns during summer when both regions are on their respective daylight times, with London at UTC+1 and New York at UTC-4.

For a deeper dive into this city pair, see our London vs New York complete time zone guide and comparison tool.

The Temporary Four-Hour Shift

Two short periods in 2026 change that pattern:

From March 8 to March 29, 2026, New York has moved to DST while London has not, narrowing the gap to four hours.

From October 25 to November 1, 2026, London has reverted to GMT while New York remains on DST, again making the difference four hours.

Learn more about these transitions in our complete 2026 daylight saving time guide. Check the holidays and observances page to see which days affect these cities.

Quick way to never get confused: Use the compare time tool to see live times for both cities side-by-side. That view reflects the current offsets and shows whether your “usual” meeting time has effectively shifted for one side. For traders, see our global trading hours guide to catch London and New York market overlaps.