Countdown Timer
Set a countdown and get alerted when time is up.
How to use Countdown Timer
- Set the target date and time.
- Click start — the remaining time counts down live.
- A "Time's up!" message appears automatically when it reaches zero.
Frequently asked questions
Can I set a countdown to a time in the past?
No — Start silently does nothing if the target time is invalid or already earlier than the current time.
Does the countdown drift if the tab is backgrounded for a while?
No — each tick recalculates the remaining time from the target minus the current time, rather than subtracting a fixed second each tick, so it stays accurate even if the browser throttles timers on an inactive tab.
Does it alert me with a sound or notification when time's up?
No — it just shows a "Time's up!" message on the page; there's no sound or browser notification.
Community
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