Online Alarm Clock, Timer, Stopwatch and Time Tools
Set an alarm or start a timer, time laps on the stopwatch, check sunrise and sunset, tonight's moon phase or today's tides, and compare the time anywhere on the world clock.
Or watch the sky move: the Sun, Earth & Moon simulator shows day and night, the seasons and the phases from your own town, and the solar system simulator puts the planets on their real orbits. Both are built to teach from — there is a classroom guide for using them, and the timer and stopwatch, on a projector.
Open to see the full screen bedside clock.
- Lap 300:04.5100:12.47
- Lap 200:03.8600:07.96
- Lap 100:04.1000:04.10
Sunrise & Sunset
The cities below run north to south. The farther from the equator, the more day length swings with the season — long summer days, short winter ones.
Everything here runs on a projector and needs no sign-up. The guide sets out what a browser timer can and cannot be trusted with before a lesson depends on it.
The classroom guide →Where the sun and moon are from your town, at any moment.
Event countdowns
Live countdowns to birthdays, holidays, sports and the days you're waiting for.
Can't find it? Suggest a birthday, holiday or event and we'll consider adding a countdown for it.
Guides: using the timer & stopwatch in a classroom · how these numbers are worked out · how it works · browser limitations · about this site.