New York to London Time Difference: EST/EDT vs GMT/BST

New York and London are two of the world's most important business hubs — and the time difference between them is not always the same. It shifts between 4 and 5 hours depending on when daylight saving time kicks in.

Standard Time Difference (Winter)

During winter (late October to early March), New York is on EST (UTC-5) and London is on GMT (UTC+0). The time difference is exactly 5 hours — London is 5 hours ahead of New York. So when it is 9:00 AM in New York, it is 2:00 PM in London.

Summer Time Difference

During most of summer (mid-March to late October), New York is on EDT (UTC-4) and London is on BST (UTC+1). The time difference is still 5 hours. However, there are two 3-week windows each year (March 9–30 and October 26 – November 2) when the US and UK are on different clock schedules, making the gap only 4 hours.

The 4-Hour Gap: The Tricky Transition Weeks

The most confusing period is those transition weeks: March 9–30 (US has switched to EDT but UK is still on GMT) and October 26 – November 2 (UK has switched back to GMT but US is still on EDT). During these windows, New York is only 4 hours behind London instead of 5. Always double-check recurring meetings during these dates.

Best Meeting Times: New York and London

The ideal meeting window when the difference is 5 hours: 9:00 AM – 12:00 PM New York (2:00 PM – 5:00 PM London). Both cities are solidly in business hours. Avoid scheduling New York afternoons — 3:00 PM New York is 8:00 PM London, which is after-hours for most people.

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❓ Common Questions

How many hours ahead is London compared to New York?

London is usually 5 hours ahead of New York. During the transition weeks in spring and autumn when the US and UK switch clocks on different dates, the gap is temporarily 4 hours.

What time is it in London when it is 9 AM in New York?

When it is 9:00 AM in New York (EST), it is 2:00 PM in London (GMT) in winter. During the summer months (both on standard offsets), it is also 2:00 PM London time.

Why does the time difference between New York and London change?

Because the US and UK switch to daylight saving time on different dates. For a few weeks in spring and autumn, one is on summer time while the other is still on standard time, reducing the gap from 5 to 4 hours.

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