Countdown timer
Count down to a date and time or run a timer for a set duration, with a beep at zero, the time left in the tab title and a shareable link.
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Use "Count down to a date" for events such as a launch, an exam or a holiday: pick the date and time in your local time zone and the page shows days, hours, minutes and seconds left. Use "Count down a duration" for a kitchen or presentation timer: set hours, minutes and seconds, then pause and resume as needed.
At zero the page plays three short beeps through the Web Audio API (turn "Beep at zero" off for silence) and the result is announced to screen readers. While a countdown runs, the remaining time also appears in the browser tab title, so you can keep an eye on it from another tab.
The countdown is stored in the page address, as an exact UTC target (?to=) or a duration in seconds (?d=), plus an optional label. "Copy share link" sends that address to someone else: a date countdown shows the same moment everywhere, converted to each viewer's own clock.
How to use it
- Choose "Count down to a date" or "Count down a duration".
- Enter the date and time, or the hours, minutes and seconds, and an optional label.
- Press "Start countdown". The time left is shown on the page and in the tab title.
- Pause, resume or reset a duration timer; copy the share link to send the countdown to others.
Frequently asked questions
Will the timer stay accurate if I switch tabs?
Yes. The remaining time is always recalculated from the fixed end moment, not by counting ticks, so it is correct when you come back. Browsers slow down timers in background tabs, so the beep itself can arrive late when the tab is hidden; keep the tab visible if the exact second matters.
Why did I not hear a beep?
Browsers only allow sound after you have interacted with the page. Pressing "Start countdown" unlocks audio; a countdown opened from a shared link may stay silent until you click somewhere on the page. Also check that "Beep at zero" is ticked and the device is not muted.
Which time zone is the target date in?
Your device's local time zone when you set it. The link stores the moment in UTC, so a friend in another country sees the same moment counted down on their own clock.
How long can a countdown be?
A date countdown can target any future date your browser accepts. A duration timer runs up to 99 hours, 59 minutes and 59 seconds.
Does the countdown account for daylight saving time?
Yes. The target is an absolute moment, so a DST change in between simply means the local clock reading jumps; the number of seconds left is unaffected.
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