London
United Kingdom · Greenwich Mean Time · UTC+0 now
Sun 28 Mar 2027in 149 days
At 01:00 clocks go forward 1 hour to 02:00
GMT → BST, UTC+0 → UTC+1 · the night is 1 hour shorter
Daylight saving time change dates
See exactly when the clocks go forward or back in every place you care about, by how much, and the awkward weeks when the gap between two places is an hour off because only one of them has changed.
- London
- New York
- Sydney
- Mumbai
New York
United States · Eastern Daylight Time · UTC−4 now
Sun 1 Nov 2026in 2 days
At 02:00 clocks go back 1 hour to 01:00
EDT → EST, UTC−4 → UTC−5 · 1 hour of the night happens twice
Sun 14 Mar 2027in 135 days
At 02:00 clocks go forward 1 hour to 03:00
EST → EDT, UTC−5 → UTC−4 · the night is 1 hour shorter
Sydney
Australia · Australian Eastern Daylight Time · UTC+11 now
Sun 4 Apr 2027in 156 days
At 03:00 clocks go back 1 hour to 02:00
AEDT → AEST, UTC+11 → UTC+10 · 1 hour of the night happens twice
Sun 3 Oct 2027in 338 days
At 02:00 clocks go forward 1 hour to 03:00
AEST → AEDT, UTC+10 → UTC+11 · the night is 1 hour shorter
Mumbai
India · India Standard Time · UTC+5:30 now
No clock changes in the next 12 months: UTC+5:30 all the way through.
Add a place above to see its clock changes.
How the gaps shift
Compared with London, the first place on your list, in the next 12 months.
New York is 5 h behind of London most of the time, but:
- 4 h behind until 1 Nov
- 4 h behind from 14 Mar to 28 Mar
Sydney is 9 h ahead of London most of the time, but:
- 11 h ahead until 28 Mar
- 10 h ahead from 28 Mar to 3 Apr
- 10 h ahead from 2 Oct onwards
Mumbai is 4 h 30 min ahead of London most of the time, but:
- 5 h 30 min ahead until 28 Mar
How the dates are found
There is no list of dates inside this page. Your browser carries the IANA time zone database, and the page asks it for each place's UTC offset one day at a time across the period. Where the offset differs from one day to the next, it halves the gap again and again until it has the exact second the clocks change. That is why it also finds unusual changes, such as Lord Howe Island moving by 30 minutes or Morocco changing around Ramadan.
The rules in brief
Most of the United States changes at 02:00 local time on the second Sunday of March and the first Sunday of November. The European Union, and the United Kingdom with it, changes on the last Sundays of March and October, all at the same instant. Much of the southern hemisphere does the opposite, moving forward in September or October. Many countries, including India, Japan and China, do not change at all. Because the dates differ, the gap between two places can be an hour off for a few weeks each spring and autumn; the list above shows exactly when.
Sources
- United States Code, 15 U.S.C. § 260a: Advancement of time or changeover dates (Legal Information Institute).
- NIST. Daylight Saving Time (DST).
- European Commission. Summertime (Directive 2000/84/EC).
- Internet Assigned Numbers Authority. Time Zone Database.
Questions
Why does my phone change at the right moment but this list says a different date?
Both use time zone data, but a device that has not been updated for a while can hold old rules. Update your browser and system; if they still differ, the government may have changed the rule very recently.
What do the calendar reminders contain?
An all-day event on the local date of each change, titled with the place and what happens, so you can warn friends or rearrange a call. They import into most calendar apps.
Is it summer time or winter time that is "real"?
Neither is more correct. Standard time is the zone's base offset; daylight saving time adds to it, usually one hour, for part of the year.