Daylight saving time
Twice a year clocks shift by an hour. timer.ly accounts for these shifts when computing countdowns.
Fall back — an hour appears
When clocks go back in autumn (e.g. CEST → CET), the day is 25 hours long. A countdown that crosses the transition shows one extra hour, because that hour is real elapsed time you actually live through.
Spring forward — an hour disappears
When clocks jump ahead in spring (e.g. CET → CEST), the day is 23 hours long. A countdown that crosses the transition shows one hour less.
Default behavior
By default timer.ly displays calendar-day arithmetic so the day count and HH:MM:SS match wall-clock subtraction. Toggle "Include daylight saving time" on a curated countdown to count every UTC second instead.
Upcoming DST changes
When clocks shift in the regions covered by this site:
United Kingdom
| Year | Spring forward | Fall back |
|---|---|---|
| 2026 | Sunday, March 29, 2026 | Sunday, October 25, 2026 |
| 2027 | Sunday, March 28, 2027 | Sunday, October 31, 2027 |
| 2028 | Sunday, March 26, 2028 | Sunday, October 29, 2028 |
United States
| Year | Spring forward | Fall back |
|---|---|---|
| 2026 | Sunday, March 8, 2026 | Sunday, November 1, 2026 |
| 2027 | Sunday, March 14, 2027 | Sunday, November 7, 2027 |
| 2028 | Sunday, March 12, 2028 | Sunday, November 5, 2028 |