Countdown Timer
A live countdown to any date and time, ticking down in days, hours, minutes and seconds against your device clock. Runs entirely in your browser, even offline.
Time remaining
-
How it works
The countdown ticks every second against your device's clock, in your local time zone. When the target moment arrives it switches to a “time's up” message; set a moment in the past and it shows how long ago it was instead.
Nothing is sent anywhere, the timer runs entirely in your browser, so it keeps counting even offline.
What this does
A countdown timer ticks down to any future date and time, showing the remaining days, hours, minutes, and seconds against your device clock.
How to use it
- Enter the target date and time.
- Add an event label (optional).
- Watch the live countdown.
- It counts up if the moment has already passed.
How it works
The target you enter is read as your device’s local time and compared with your computer or phone clock each second, so it stays accurate even offline.
remaining = target time − now
Understanding your result
The remaining time is measured against your own device clock, so if your computer or phone clock is off, the countdown is off by the same amount. The target is read as your local time, not the viewers, so a deadline you share reaches zero at a different wall-clock moment in another time zone. It keeps counting while offline because nothing is fetched, the math is all local.
Example
Set to midnight on 1 January and the timer shows the days, hours, minutes, and seconds left until the new year.
Sources & methodology
Last updated .
Frequently asked questions
What time zone does it use?
Your device’s local time zone. The target time you enter is interpreted as local time and counted against your computer or phone clock.
What happens when it reaches zero?
It shows a “time’s up” message (with your event label, if set). If you enter a moment in the past, it counts up to show how long ago it was.
Is my data stored?
No. The timer runs locally in your browser and nothing is sent anywhere.
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