A timer and a world clock, with nothing in the way

Pick a length and it starts counting. Pick a city and it tells you the time there, whether that place is on summer time, and the date it next changes. Everything on this page runs in your browser, so nothing waits on us.

The countdown does not drift

Browsers throttle timers in background tabs, so anything that counts ticks loses minutes while you are somewhere else. Every clock here measures against a monotonic source and works out the remainder, which means a backgrounded tab, a throttled worker or a closed laptop lid changes nothing about what it shows when you come back.

Time zones come from the database, not from a list

Offsets are computed for the instant you asked about, using the IANA time-zone database your browser already carries. Nothing here stores an offset, because half the world's offsets change twice a year and a stored one is confidently wrong for six months at a time. This build was made against tzdata 2025b.

The pages know what a snippet cannot

A page saying "London is UTC+1" is right for seven months and wrong for five, and it looks identical either way. Every clock page here says what the place does across a whole year and the exact instant its clock next moves — which is the part you actually needed.

Questions

Do the timers keep running if I switch tabs?

Yes. The countdown is measured against a monotonic clock rather than counted in ticks, so a backgrounded tab, a throttled timer or a laptop lid closing does not lose time — when you come back it shows what it should, not what it managed to count.

Do I need an account?

No. Every timer, stopwatch, clock, converter and calendar view here works signed out, with no email and no limit. An account exists for three things only: keeping your saved timers across devices, an alert that reaches you with this tab closed, and subscribing to a calendar.

Where do the time zones come from?

From the IANA time-zone database, through your own browser and our build runtime rather than a list we typed out. This build was made against tzdata 2025b, which names 418 zones. We show that version because a stale time-zone database is a wrong answer that looks completely right.

Why does the difference between two time zones change during the year?

Because countries change their clocks on different dates. The United States moves in March and November, the European Union in the last weekends of March and October, and the southern hemisphere moves the opposite way entirely. For a few weeks each year the usual gap is an hour out, which is when most mis-scheduled calls happen.