About this tool
The Countdown Timer is a live clock that counts down the days, hours, minutes, and seconds until a date and time you choose. Pick a target in the date-and-time field and the four figures update once every second, in the browser tab.
The target is read in your device's local time zone and compared against your system clock. When the moment arrives, the label flips from remaining to elapsed and the figures start counting upward, so you can see how long ago it passed without resetting anything.
Because each tick recomputes from the current clock instead of decrementing a stored number, it stays accurate even after the tab sits idle. Everything runs locally — no target leaves your machine, no account is required, and nothing is tracked.
Frequently asked questions
What happens after the target passes?
The label switches from remaining to elapsed and the four figures count upward, showing how much time has passed since the target. Nothing resets, so the elapsed total keeps growing.
Does it keep running?
Yes, the display refreshes every second while the tool is open. Each update recomputes from your system clock rather than decrementing a stored value, so it stays correct even if the browser throttles the timer in a background tab.
Which time zone is the target in?
The date and time you pick are interpreted in your device's local time zone, and the countdown is measured against your system clock. Changing your computer's clock or zone shifts the result accordingly.
Does it sound an alarm or send a notification at zero?
No. When the target is reached it only changes the on-screen label to elapsed and keeps counting; there is no sound, alarm, or push notification, and the tab must stay open for it to run.