Set the hour, minute, and second for the online countdown timer, and start it. Alternatively, you can set the date and time to count days, hours, minutes, and seconds till (or from) the event. The timer triggered alert will appear, and the pre-selected sound will be played at the set time.

When setting the timer, you can click the "Test" button to preview the alert and check the sound volume.

Click the "Reset" button to start the timer from the initial value. Click the "Stop" ("Start") button to stop (start) the timer.

You can add links to online timers with different time settings to your browser's Favorites. Opening such a link will set the timer to the predefined time.

In the holiday list, you can launch a countdown timer for any holiday on the list, or you can create a new timer for your own event or holiday. Make sure to share your timer with your friends.