Count down from a set time with pause, resume and reset, staying accurate even in a background tab.
Live Unix timestamp with bidirectional conversion, multi-timezone and multi-format output
Open →Find the difference between two dates, add or subtract time, and count workdays.
Open →Calculate exact age from a date of birth, with a countdown to the next birthday.
Open →No comments yet. Be the first!
Set hours, minutes and seconds, then count down with pause, resume and reset. It uses target-time math, so a background tab does not lose accuracy.
No. Remaining time is computed from a fixed target instant, not decremented once per second — so even if the browser throttles a background tab's timer, switching back shows the correct remaining time immediately.
No notification permission is requested. The tool shows a "Time's up" state on the page, and if you check "Play a sound", it plays a short synthesized tone.
Yes — pausing records the remaining time at that instant, and resuming sets a new target as "now + remaining time", so nothing is over- or under-counted.
