User-Configurable Countdown Timer

This page provides a simple Javascript-based countdown timer. It was created for conference session chairs, so that they can show a remaining-time display to speakers. However, others may find it useful as well.

By default, the timer operates as follows: it counts down from five minutes to zero minutes, updating every ten seconds. When one minute remains, the background turns yellow and the timer is updated every five seconds. At 30 seconds remaining, the background turns red and updates are continuous. Finally, when time runs out, the counter starts blinking. The counter can be restarted by simply reloading the counter page.

All aspects of the counter can be configured by changing entries in the following form.

Timer Options

Count down for minutes and seconds.
Update counter every seconds.
Use warning color when seconds left and update every seconds.
Use alarm color when seconds left and update every seconds.
Blink when time is expired:
Countinue counting to negative numbers after time is expired:

Appearance Options

Display timer in a font.
During normal countdown, display timer in on a background.
During warning period, display timer in on a background.
During alarm period, display timer in on a background.

Sound Options

Beep times at Hertz for milliseconds each when the warning time is reached.
Beep times at Hertz for milliseconds each when the alarm time is reached.
Beep times at Hertz for milliseconds each when time expires.