Countdown Timer
Count down to a launch, deadline, birthday or the new year — in any time zone.
Countdown
Time remaining
Saved countdowns
How it works
A countdown measures from now to a fixed future instant. You give it a date, a time and a zone, and those three together resolve to a single moment; the display is the difference between that moment and the present, broken into days, hours, minutes and seconds.
Naming the zone is what makes the result shareable. "Midnight on 31 December" is a different instant in Auckland and in Los Angeles — nearly a full day apart — so a countdown without a zone is ambiguous the moment it crosses a border. Because the target is stored as an instant, everyone opening the same link counts down to the same moment even though their clocks read differently.
The remaining time is recomputed from timestamps on every update rather than decremented, so a background tab, a sleeping laptop or a slow machine cannot make it drift. Settings live in the address bar, which means the link is the countdown.
Examples
A product launch. Set 09:00 on 1 September in New York. Anyone you send the link to sees the same moment approaching, counted in their own local terms.
New Year. Midnight on 31 December in your own zone is a different instant from midnight in Sydney, which is why the world sees fifteen separate new years. Choosing the zone explicitly is the whole point.
A deadline. Point a countdown at a submission cut-off and leave the tab open. It stays accurate whether the machine sleeps or the tab sits in the background for a week.
Practical notes
Always set the zone deliberately. A countdown to "midnight on 31 December" without one is not a countdown to a moment — it is a countdown to a smear nearly a day wide, and the recipients furthest from you will see it finish at what looks like the wrong time.
The link is the artefact worth sharing. Everything is encoded in the address bar, so the URL reproduces the countdown exactly; a screenshot or a written time does not.
For countdowns of several months, remember that the target instant is fixed but your own offset may not be. If your zone changes its clocks between now and then, the local wall-clock time of the event shifts by an hour even though the countdown itself stays correct.
Frequently asked questions
Can I share a countdown?
Yes. The address bar holds the whole countdown, so copying the link is enough — no account or saved page required.
Where are saved countdowns stored?
In this browser’s local storage. They are not synced between devices.
Does the countdown keep running in a background tab?
Browsers throttle background tabs, so the display may update less often — but the value shown is always recalculated from the real clock, so it is correct the moment you return.
Why does the countdown need a time zone?
Because a date and a time alone do not identify a moment. Midnight on the same date is nearly a day apart between Auckland and Los Angeles. The zone turns a wall-clock reading into an instant everyone can agree on.
Does it stay accurate if I leave the tab?
Yes. The remaining time is recalculated from the target instant on each update rather than counted down, so nothing accumulates error.
Can I count down to a past date?
The tool is built for future instants. A past target simply shows as elapsed rather than counting up.
Does it work offline?
Yes. The page is cached and the countdown is arithmetic against your device clock, so no connection is needed once it has loaded.
Can I embed a countdown on my site?
Not directly, but the clock widget generates a self-contained snippet you can adapt.
Can I hide the seconds?
Yes. For a countdown of weeks, seconds are noise, and turning them off makes the figure easier to read at a glance.
Can I count down to a time today?
Yes. Any future instant works, from a few minutes ahead to years away, and the display adjusts the units it shows to suit the span.
Why does my countdown differ from someone else's?
Because you are counting to different instants. A target set as midnight in your own zone is a different moment from midnight in theirs, and the two countdowns will disagree by exactly the offset between you. Sharing the link rather than the date removes the discrepancy entirely.