Give it a name and a moment — a wedding, a launch, a deadline, retirement day — and watch the exact days, hours, minutes and seconds tick away. When the moment arrives, the same page flips over and starts counting how long ago it was.
A countdown to a date is a single subtraction: target moment − now, with the gap then split into whole days, hours, minutes and seconds. The page repeats that subtraction four times a second from your device clock, so it cannot drift — and because it works from timestamps, the count is exact when you return to a background tab. The moment the gap crosses zero, the subtraction naturally goes negative; the page takes the size of the gap and relabels it as time since the event, so the same counter covers anniversaries and “days since” tracking without any setup change.
Times are read in your device’s own time zone — the date and time you pick mean that moment where you are.
Short countdowns in minutes, with a progress ring and alarm at zero.
Free — try itRepeating focus-and-break cycles for study and desk work.
Free — try itCount working days and scheduled hours between two dates instead.
Free — try itCount up from zero with lap splits and a lap table.
Free — try itNothing breaks and nothing stops: the page recognises that the target has passed and flips into “time since” mode, counting up from the event — days, hours, minutes and seconds since it happened, with the heading updated to say so.
Yours. The date and time you pick are interpreted in your device’s local time zone, and the countdown is measured against your device clock. If you are counting down to an event in another city, the Time Zone Converter on this site shows what your target moment is in that city.
Yes — the days figure has no cap, so a retirement date or a graduation years away counts down the same way, in whole days plus the hours, minutes and seconds left over.
The page recomputes the gap four times a second so the last second never looks frozen, and it recomputes from the clock each time rather than decrementing a stored number — that is what keeps it exact in a background tab.
No — the event lives only in the open page. Keep the tab open (background is fine) for as long as you want the countdown running.
One subtraction, then successive division — the same arithmetic every countdown uses:
It is 3:04:05 PM on Monday and you set a countdown to 9:00:00 AM on Friday — a product launch. The gap is 3 days, 17 hours, 55 minutes and 55 seconds, so the page reads 3 days, 17 hours, 55 minutes, 55 seconds and ticks down from there. Check it again exactly 24 hours later and it reads 2 days, 17:55:55 — one whole day gone, the rest untouched. If you open the page an hour after the launch, it already reads 0 days, 1 hour since the event in time-since mode, no action needed.
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