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 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. Finance teams on this corridor front-load their day — morning New York, afternoon London.
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)
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
Use the live clocks and the table for different jobs. The live clocks show the current offset between New York and London. The table gives you a stable reference for planning common hours. If the page has more than one table column, pick the column that matches the season or DST state shown in the column label.
Daylight saving is the main trap. Some pairs stay fixed all year, while others move by one hour because only one side changes clocks, or because the two sides change on different dates. That is why this page keeps the daylight saving note near the live clocks and labels alternate table scenarios instead of hiding the offset change in a paragraph.
Always check the calendar date when the converted time lands near midnight. A late evening time in New York can become the next day in London, and an early morning time can still be the previous day. If the table marks "next day" or "prev day", include that date shift in the message or calendar invite.
Abbreviations can be ambiguous. ET can mean EST or EDT; London can be GMT or BST; Sydney can be AEST or AEDT. City names and IANA time zones are safer for exact scheduling than abbreviations alone. For recurring meetings, test the same local time once in January and once in July before you lock it in.
For one-off events, enter the exact date and time in the main time zone converter or meeting scheduler if the table does not show your hour. That keeps the answer tied to the correct daylight saving rule instead of a memorized offset.
When you share the result, write both local times in one line: "10:00 AM ET/ converted GMT time." For client calls, flights, webinars, launches, and deadlines, also include the date. The extra wording feels repetitive, but it gives every recipient a second way to catch a timezone mistake before it becomes a missed meeting. It is especially helpful when someone forwards the invite to a third city.
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.