Last updated 26 August 2026
Counting down accurately
The target date and time is treated as your device's own local timezone, so the countdown always matches your own clock regardless of where you are. It recalculates every second for as long as the page is open, and switches to a simple arrival message once the target time is reached, rather than showing negative numbers.
It counts from your device clock
The countdown is worked out from the time your phone or computer thinks it is. That is almost always right, but it means a device with a wrong clock will show a wrong countdown, and two people in different places will see different numbers for the same moment — correctly, since the target time is being read in each viewer's local zone.
If you are sharing a deadline with people elsewhere, say which zone you mean. "Midnight" is a different instant in Karachi and in London, and the difference has ended more than one submission window earlier than people expected.
Leaving the page open keeps the countdown live; closing it stops nothing, because the target date is a fixed point rather than something the timer is tracking. Reopening the page later simply recalculates from the clock again.
Common questions
What timezone does it use?
Your device's own local timezone — the date and time you pick is treated as happening in whatever timezone your browser is currently set to, so the countdown always matches your own clock.
Does it keep counting if I leave the tab open?
Yes, it updates every second for as long as the page stays open. Closing the tab or refreshing simply recalculates from the same target date and time when you come back — nothing is lost.
What happens when the countdown reaches zero?
The timer stops and a simple arrival message replaces it, rather than showing negative numbers or continuing to count upward.