Time in London, GMT or BST, whichever is on.

The time in London is Greenwich Mean Time, GMT, which is UTC+0, in winter, and British Summer Time, BST, which is UTC+1, in summer. People often say "GMT" for London time all year, but in summer the London clock is an hour ahead of GMT. The big clock above shows London to the second, and the card says whether it is on GMT or BST right now.

How to use this London time page

1. Read the big clock: hours, minutes and seconds in London, then the date, the name of the zone and its UTC offset.
2. The cards under it show the time zone, the UTC offset, whether the place changes its clocks and when next, and the difference from your own time zone. If the page has guessed your zone wrong, pick the right one under Your place.
3. To plan a call, set a Date and a Time under What time is it there when it is. The line under the boxes gives the time in London, with the day. Use now sets your own current time.
4. The row of eight times below shows common hours of your day, every three hours, next to the matching time there.
5. On the right, tick 24-hour clock or switch Show seconds off. Copy the time copies one line you can paste into a message. Your choices stay in this browser.

What the official sources say

The UK government page "When do the clocks change" says the clocks go forward 1 hour at 1am on the last Sunday in March and back 1 hour at 2am on the last Sunday in October. It gives 29 March and 25 October for 2026 and 28 March and 31 October for 2027. It names GMT as the UK's standard time, in effect when the clocks are set back, and BST as the period when the clocks are 1 hour ahead. Checked 24 Oct 2026.

When the clocks change

The UK government gives these dates: forward at 1am on the last Sunday in March, back at 2am on the last Sunday in October.

The cards above give the next change from your browser's own data. Dates in the table come from the IANA database, version 2026e, read on 24 Oct 2026.

GMT and London are not the same all year

GMT is a time standard that stays at UTC+0. London is on it only in winter. From the last Sunday in March to the last Sunday in October the city is on BST, UTC+1. A meeting booked at "10:00 GMT" in July is at 11:00 on the London wall clock. If you mean London local time, write "London time" or "UK time", and the right name follows from the date.

The same clock beyond London

Scotland, Wales and Northern Ireland use the same clock as London. The IANA database also links the Isle of Man, Jersey and Guernsey to the London zone, so all of them show the same time as the clock above.

London compared with other places

The gap with New York through 2026

The two places do not change their clocks on the same days, so the gap is not one number. Each row starts on the day the gap changes, by the clock in London. The change happens at a set hour that day, so use the box above for an exact time.

A worked example

Take a 9:00 AM call in London and ask what time it is in New York.

• In July, 9:00 AM on Tue 14 Jul in London is 8:00 AM UTC on Tue 14 Jul (9:00 AM minus 1 h). New York is on UTC-4, so the same moment is 4:00 AM on Tue 14 Jul there.
• In January, 9:00 AM on Tue 13 Jan in London is 9:00 AM UTC on Tue 13 Jan (9:00 AM, no change). New York is on UTC-5, so the same moment is 4:00 AM on Tue 13 Jan there.

Shared working hours

If both sides work 9:00 AM to 5:00 PM, this is the window in which both are at their desks, on a Tuesday in January and a Tuesday in July 2026.

Sources, checked 24 Oct 2026. GOV.UK, When do the clocks change; the IANA time zone database (version 2026e).

Related: GMT to EST, and the time zone converter.