timer.ly logotimer.ly

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

YearSpring forwardFall back
2026Sunday, March 29, 2026Sunday, October 25, 2026
2027Sunday, March 28, 2027Sunday, October 31, 2027
2028Sunday, March 26, 2028Sunday, October 29, 2028

United States

YearSpring forwardFall back
2026Sunday, March 8, 2026Sunday, November 1, 2026
2027Sunday, March 14, 2027Sunday, November 7, 2027
2028Sunday, March 12, 2028Sunday, November 5, 2028

Back home