New York vs London Time Difference — EST/EDT and GMT/BST
Updated: May 2026
New York (America/New_York) and London (Europe/London) are connected by one of the world's busiest time zone corridors. The gap is 5 hours for most of the year, but drops to 4 hours during two brief windows each year when the US and UK switch clocks on different dates. This page covers the full 2026 offset calendar, a business-hours conversion chart, and best practices for transatlantic scheduling.
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2026 offset calendar: when the gap is 4 vs 5 hours
The two 4-hour windows (March 8–28 and October 25–31 in 2026) are when recurring transatlantic meetings most often appear at the wrong time in calendars. Calendar invites that encode the meeting as "5 PM EST" rather than using the IANA time zone name America/New_York will shift by one hour during those weeks.
New York to London conversion table (standard, +5h)
| New York (EST/EDT) | London (GMT/BST) | Note |
|---|---|---|
| 12:00 AM | 5:00 AM | NY midnight → early London morning |
| 6:00 AM | 11:00 AM | NY early morning → London midday |
| 8:00 AM | 1:00 PM | NY work starts → London afternoon |
| 9:00 AM | 2:00 PM | Best call window opens |
| 10:00 AM | 3:00 PM | Ideal meeting slot |
| 11:00 AM | 4:00 PM | Good overlap window |
| 12:00 PM | 5:00 PM | London end of day |
| 1:00 PM | 6:00 PM | London after work |
| 5:00 PM | 10:00 PM | NY end of day → London late evening |
| 11:00 PM | 4:00 AM (+1 day) | — |
Financial market overlap hours
New York and London host the two largest financial centers in the world. Their overlapping trading hours (NYSE/NASDAQ open, LSE still open) drive the highest global currency and equity volatility of the day.
- LSE opens: 8:00 AM GMT / 3:00 AM EST
- NYSE opens: 9:30 AM EST / 2:30 PM GMT
- LSE closes: 4:30 PM GMT / 11:30 AM EST
- NYSE closes: 4:00 PM EST / 9:00 PM GMT
- Overlap window: 2:30 PM–4:30 PM GMT / 9:30 AM–11:30 AM EST. This 2-hour window is when both markets are simultaneously open and liquidity is highest for transatlantic instruments.
During the transition weeks (March 8–28 and October 25–31 in 2026), the overlap window shifts by one hour in GMT terms — a critical detail for algorithmic trading systems that hard-code UTC offsets.
Tips for NY–London scheduling
With a 5-hour gap and only 3 hours of shared business time (9 AM–12 PM EST / 2 PM–5 PM GMT), transatlantic meeting windows fill up quickly on both sides. A few practices reduce scheduling friction:
- Use IANA zone names, not abbreviations: Calendar invites using America/New_York and Europe/London are automatically adjusted for DST by every major calendar application. Hard-coding "EST" or "5 PM EST" will be misread during transition weeks.
- Anchor to 10 AM EST: A 10 AM New York meeting is 3 PM London — a comfortable afternoon slot for both parties, with no concern about early starts or missed commutes.
- Send agendas before 5 PM GMT: If you need London to prepare before the meeting, send materials well before the London working day ends. New York's morning is London's afternoon; a 9 AM EST message arrives at 2 PM GMT, with only 3 hours for the UK side to prepare before end of day.
- Record all calls: The overlap window is narrow. If someone misses the meeting, a recording avoids the need to reschedule across a 5-hour barrier.
Frequently asked questions
How many hours is New York behind London?
New York is 5 hours behind London for most of the year. During two brief transition windows (March 8–28 and October 25–31 in 2026), when the US and UK switch clocks on different dates, the gap is only 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 or EDT), it is 2:00 PM in London (GMT or BST). Add 5 hours to convert from New York to London time in the standard period.
What is the best time to call London from New York?
The best window is 9 AM–12 PM New York time (2 PM–5 PM London). This is morning for New York and afternoon for London, giving both sides comfortable working conditions. After noon New York time, London is approaching or past end of day.
When does the time difference between New York and London change in 2026?
The gap drops to 4 hours from March 8 to March 28 (US on EDT, UK still on GMT) and again from October 25 to November 1 (UK back on GMT, US still on EDT). Outside these windows, the gap is 5 hours.
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