New York to London Time Converter
London is 5 hours ahead of New York for most of the year. During short DST transition windows, the gap can briefly shrink to 4 hours.
Daylight saving note: Normally 5 hours. During the short March/October transition windows, London can be 4 hours ahead while New York is on EDT and London is on GMT.
ET to GMT/BST Conversion Table
Full 24-hour reference table. Use the live clocks above for the exact current offset.
| 🇺🇸 ET | 🇬🇧 EST → GMTUTC-5 to UTC+0 | 🇬🇧 EDT → BSTUTC-4 to UTC+1 | 🇬🇧 EDT → GMTUTC-4 to UTC+0 transition weeks | Note |
|---|---|---|---|---|
| 00:00 | 5:00 AM | 5:00 AM | 4:00 AM | |
| 01:00 | 6:00 AM | 6:00 AM | 5:00 AM | |
| 02:00 | 7:00 AM | 7:00 AM | 6:00 AM | |
| 03:00 | 8:00 AM | 8:00 AM | 7:00 AM | |
| 04:00 | 9:00 AM | 9:00 AM | 8:00 AM | |
| 05:00 | 10:00 AM | 10:00 AM | 9:00 AM | |
| 06:00 | 11:00 AM | 11:00 AM | 10:00 AM | |
| 07:00 | 12:00 PM | 12:00 PM | 11:00 AM | |
| 08:00 | 1:00 PM | 1:00 PM | 12:00 PM | |
| 09:00 | 2:00 PM | 2:00 PM | 1:00 PM | |
| 10:00 | 3:00 PM | 3:00 PM | 2:00 PM | |
| 11:00 | 4:00 PM | 4:00 PM | 3:00 PM | |
| 12:00 | 5:00 PM | 5:00 PM | 4:00 PM | |
| 13:00 | 6:00 PM | 6:00 PM | 5:00 PM | |
| 14:00 | 7:00 PM | 7:00 PM | 6:00 PM | |
| 15:00 | 8:00 PM | 8:00 PM | 7:00 PM | |
| 16:00 | 9:00 PM | 9:00 PM | 8:00 PM | |
| 17:00 | 10:00 PM | 10:00 PM | 9:00 PM | |
| 18:00 | 11:00 PM | 11:00 PM | 10:00 PM | |
| 19:00 | 12:00 AM | 12:00 AM | 11:00 PM | next day |
| 20:00 | 1:00 AM | 1:00 AM | 12:00 AM | next day |
| 21:00 | 2:00 AM | 2:00 AM | 1:00 AM | next day |
| 22:00 | 3:00 AM | 3:00 AM | 2:00 AM | next day |
| 23:00 | 4:00 AM | 4:00 AM | 3:00 AM | next day |
* "next day" = converted time falls on the following calendar day.
Best Hours to Schedule New York–London Calls
The practical New York–London overlap is 9:00 AM–12:00 PM New York (2:00–5:00 PM London). Outside this 3-hour window, one side is before 9 AM or after 5 PM.
About New York (ET)
New York (Eastern Time, UTC-5/UTC-4) is the financial capital of the United States. The NYSE opens at 9:30 AM ET. When London's trading day ends at 4:30 PM GMT, it is only 11:30 AM in New York — the two cities share a brief but critical trading overlap.
About London (GMT/BST)
London (GMT in winter, BST in summer) is the financial capital of Europe. The London Stock Exchange opens at 8:00 AM GMT. The UK and US change clocks on different Sundays, creating brief 4-hour transition windows — worth double-checking for standing meeting invites.
How to Avoid New York–London Conversion Mistakes
London is already on the next calendar day from these ET times onward: 7:00 PM for EST → GMT, 7:00 PM for EDT → BST, 8:00 PM for EDT → GMT. For example, 11:00 PM ET is 4:00 AM in London on the next day (EST → GMT).
Abbreviations can be ambiguous here: New York switches between ET and EDT across the year, while London switches between GMT and BST. City names and IANA time zones (America/New_York and Europe/London) are safer for exact scheduling if you're automating anything, since they resolve the right abbreviation automatically instead of needing a manual seasonal check.
Worked Example: The Short Periods When the Gap Is Four Hours
Most of the year, 9:00 AM in New York is 2:00 PM in London. The US moves its clocks forward on the second Sunday in March and the UK on the last Sunday in March, so in the weeks between those two dates 9:00 AM in New York is 1:00 PM in London.
The same mismatch appears in autumn. The UK moves its clocks back on the last Sunday in October and the US on the first Sunday in November, so for a week or so the gap is four hours again. A 9:00 AM New York call that is 2:00 PM in London most of the year is only 1:00 PM in London that week.
If you're sending a recurring invite, check the weeks around those dates. London's 5:00 PM close is 12:00 PM in New York on the normal gap and 1:00 PM in the transition weeks.
Frequently Asked Questions
How many hours ahead is London from New York?
London is 5 hours ahead of New York for most of the year. During brief DST transition weeks, it can be 4 hours when New York is on EDT and London is still or already back on GMT.
What time is 9 AM New York in London?
9:00 AM New York is usually 2:00 PM London, both in EST/GMT and EDT/BST seasons. During short transition weeks, 9:00 AM EDT can be 1:00 PM GMT.
What is the best time for a New York–London call?
The 9:00 AM–12:00 PM New York (EST) window maps to 2:00–5:00 PM London. This is the only daily slot where both cities are comfortably in business hours.
Why does the New York-London time difference sometimes change?
The US and UK shift clocks on different Sundays. In spring, the US changes first; in autumn, the UK reverts first. In both transition windows, the gap can briefly be 4 hours instead of the usual 5.