Time Difference Between London and United States
As of 31 August 2026, United States is 5 hours behind London. That number is not constant. Over the course of a year, because of daylight saving changes, New York, United States ranges from 5 hours behind to 4 hours behind relative to London, United Kingdom. The calculator below is always up to date.
Tap either box to search any country or city.
London, United Kingdom
23:34
Mon, Aug 31, 2026
UTC+1 · Europe/London
New York, United States
-5h18:34
Mon, Aug 31, 2026
UTC-4 · EDT · America/New_York
United States is 5 hours behind London.
Time zone details
| Place | Local date | Time zone | UTC offset | Summer time |
|---|---|---|---|---|
| London | Monday, August 31, 2026 | Europe/London | UTC+1 | Active now |
| United States | Monday, August 31, 2026 | EDTAmerica/New_York | UTC-4 | Active now |
United States: The United States spans six main time zones. This page uses Eastern Time; Pacific Time is 3 hours behind it.
Hour by hour: London to United States
Every hour of today in London and what it is in United States. Highlighted rows fall inside United States working hours (09:00–18:00).
| London | United States |
|---|---|
| 00:00 | 19:00prev day |
| 01:00 | 20:00prev day |
| 02:00 | 21:00prev day |
| 03:00 | 22:00prev day |
| 04:00 | 23:00prev day |
| 05:00 | 00:00 |
| 06:00 | 01:00 |
| 07:00 | 02:00 |
| 08:00 | 03:00 |
| 09:00 | 04:00 |
| 10:00 | 05:00 |
| 11:00 | 06:00 |
| London | United States |
|---|---|
| 12:00 | 07:00 |
| 13:00 | 08:00 |
| 14:00 | 09:00 |
| 15:00 | 10:00 |
| 16:00 | 11:00 |
| 17:00 | 12:00 |
| 18:00 | 13:00 |
| 19:00 | 14:00 |
| 20:00 | 15:00 |
| 21:00 | 16:00 |
| 22:00 | 17:00 |
| 23:00 | 18:00 |
Best time to call or meet
Overlapping working hours
14:00–18:00 in London (09:00–13:00 in United States)
Both places are inside 09:00–18:00 for 4 hours a day. Anything in this window works without asking anyone to stay late.
Reasonable calling hours
13:00–21:00 in London (08:00–16:00 in United States)
Both people are awake and available between 08:00 and 21:00 local time during this window.
When this difference changes
London puts its clocks back on Sunday, October 25, 2026
The local offset moves from UTC+1 to UTC. After that date, United States is 4 hours behind London — instead of 5 hours behind, as it is today.
United States puts its clocks back on Sunday, November 1, 2026
The local offset moves from UTC-4 to UTC-5. The gap between London and United States stays at 5 hours because both places change at the same time.
Planning something with more than two places?
Adding a third city usually kills the obvious answer. The Meeting Time Finder takes up to five cities at once and shows only the hours that work for everybody.
London and United States: common questions
What is the time difference between London and United States?
As of 31 August 2026, United States is 5 hours behind London. The gap is not fixed: across the year, United States ranges from 5 hours behind to 4 hours behind relative to London, as clocks change. The calculator on this page always shows the difference for right now.
When it is 9:00 AM in London, what time is it in United States?
It is 04:00 AM in New York, United States. Use the time field in the calculator above to check any other hour.
Is United States ahead of or behind London?
United States is behind London by 5 hours at the moment. In practical terms, the working day in United States starts and ends later in London terms.
Do London and United States observe daylight saving time?
Both London and United States change their clocks, but not on the same dates. That is why the gap is not fixed: across the year, United States ranges from 5 hours behind to 4 hours behind relative to London.
What is the best time to call United States from London?
Working hours overlap between 14:00 and 18:00 London time, which is 09:00 to 13:00 in United States. Calls inside that window reach both sides during the normal working day.
Related comparisons
Local dates shown for London, United Kingdom (UTC+1) and New York, United States (UTC-4) were generated on Monday, August 31, 2026 UTC and refresh in your browser.