Language: EN

Online Clock

A big, clean clock for any screen. Pick digital digits that grow to fill the whole display, or an analog dial with a smooth sweeping second hand. Add the date, a second clock for another city, your own colors, and go full screen.

12:00:00PM

Click the clock or press F for full screen. Click again or press Esc to exit.

Compares your device clock with this website's server, to within about a second.

Clock

Want flipping cards? Try the flip clock. For a dim bedside clock, use the night clock.

Hours

A smaller clock for another place, with the time difference.

Font

Theme

Full screen always asks to keep it awake, in browsers that allow it.

How to use it

  1. Choose Digital or Analog, and 12 hour or 24 hour time.
  2. Turn the seconds, the date and AM and PM on or off. In analog mode you can switch between a smooth sweep and a ticking second hand, and hide the numbers for a plain dial.
  3. Pick a font and a theme. Custom lets you choose any color for the digits and the background.
  4. Click the clock or press F for full screen. Click again or press Esc to exit.

The digital clock sizes itself to the window: on a phone turned sideways, a laptop or a TV, the digits are as big as the screen allows. Your settings are saved in this browser, so the clock looks the same next time.

Is the time right? How this clock gets it

This page shows your device's own clock, in your device's time zone unless you pick another one. Computers and phones that set their time automatically keep it in step with time servers on the internet (and phones also with the mobile network), so they are usually correct to within a second. This page does not claim to be an atomic clock: it is exactly as accurate as your device.

How the seconds stay exact. Many web clocks update once a second from whenever the page happened to load, so their seconds can change up to a second late. This clock times every update to the exact moment your device's clock reaches the next second, and works out the time again from scratch at each tick, so small timer delays never add up.

Check your device clock. Press Check my device clock under the clock. It asks this website's server for its time a few times and compares it with your device. The server only reports whole seconds, so the result is good to within about a second: fine for spotting a clock that is minutes off, not for fine timing.

How to fix a wrong clock on your device

If the time is off, the fix is almost always to let the device set the time and time zone by itself:

  • Windows 11: Settings, then Time and language, then Date and time. Turn on Set time automatically and Set time zone automatically, then press Sync now.
  • Mac: System Settings, then General, then Date and Time. Turn on Set time and date automatically and check the time zone.
  • iPhone and iPad: Settings, then General, then Date and Time. Turn on Set Automatically.
  • Android: Settings, then System, then Date and time (names vary a little by phone maker). Turn on automatic time and automatic time zone.

If the clock is off by exactly one hour, the time zone or the daylight saving setting is usually wrong, not the clock itself. Most of Arizona does not use daylight saving time: if that is where you are, pick Phoenix, not Denver.

Ideas for a big screen clock

  • Second monitor or TV. A full screen clock you can read from across the room while you work, stream or cook.
  • Classrooms and meetings. Put it on the projector during a test, a workshop or breaks. The Light theme reads well in a bright room.
  • Two time zones. Working with a team or family abroad? Add a second clock, give it a name like "Office" or "Grandma", and see the difference and whether it is already tomorrow there. Copy link to this clock saves both time zones in a link you can bookmark or share.
  • Old tablet on a shelf. Plug it in, add the page to the home screen and turn on Keep the screen awake.

Prefer flipping cards like a retro desk clock? Use the flip clock. For a dim bedside clock that protects the screen overnight, use the night clock.

Questions

Is this online clock accurate?

It shows your device's clock, which is usually right to within a second when it sets the time automatically. The display changes at the exact start of each second of that clock. Use Check my device clock to compare it with this website's server, to within about a second.

Is this an atomic clock?

No. A web page cannot read an atomic clock directly. It shows the time your device keeps, and your device sets that time from internet time servers.

Can I show two time zones at once?

Yes. Pick a city under Second clock. It appears under the main clock with the time difference and a note when it is already the next day or still the previous day there. You can also change the main clock's time zone.

Does it handle daylight saving time?

Yes. Time zones use your browser's own time zone data, so the clocks switch to and from daylight saving time on the right dates by themselves.

Will the screen stay on?

In full screen, and whenever Keep the screen awake is on, the page asks the browser to keep the screen on. Most current browsers allow it. If yours does not, set a longer auto-lock or sleep time in your device settings.

How do I exit full screen?

Click or tap the clock, or press Esc.