Countdown Timer
Days, hours, minutes and seconds until your moment, live.
Pick a future date and time and watch the countdown tick down to the second. It keeps running in the page, shows the total in days, hours, minutes and seconds, and tells you how much time has passed if the moment is already behind you. Your device clock drives it, so a wrong device clock gives a wrong countdown.
Honest limits. The countdown uses your device clock and your device time zone, and the target you type is read in that same time zone. If you share the page, someone in another time zone sees the same local time you typed, not the same instant, unless you both agree on the zone first. The timer stops ticking if you close the tab or the device sleeps; reopening it picks up from the current clock, which is the correct behaviour for a countdown, but it means this page is not an alarm and will not wake you.
How a countdown is actually counted
A countdown is a subtraction: the target instant minus now, split into days, hours, minutes and seconds. The split is what trips people up, because a day is not always 24 hours. On a day when clocks jump for daylight saving, the gap between two midnights can be 23 or 25 hours, and a countdown built on calendar days would be an hour out. This page subtracts real elapsed time, in milliseconds, and then splits the remainder, so a daylight-saving change in the middle lands correctly and the seconds keep ticking at one per second.
The other trap is time zones. A datetime typed without a zone is a local time, and two people in different zones reading the same typed time mean two different instants. For a flight, an exam or a deadline that other people share, agree on the zone first, then type the time as it reads in your own zone, and double-check the total days figure against your ticket or notice before you rely on it.
Why the seconds matter
Most countdowns only need days, but the seconds do real work: they prove the timer is live, they show a deadline crossing zero the moment it passes, and they catch a wrong target immediately, because a target typed as next month instead of this month shows 30 days where you expected 2.
A countdown is not an alarm
This page shows the time remaining; it does not sound when it reaches zero, and it stops while the tab is closed. For anything you must not miss, set a phone alarm or calendar reminder as well, and use this page to see how long is left.
Frequently Asked Questions
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