Countdown Timer
Live countdown to any future date and time.
Overview
The Countdown Timer ticks down to any future date and time in real time, showing the remaining days, hours, minutes, and seconds in a large readout that updates once per second. Pick a target moment in the future and leave the page open — the figure refreshes live until the moment arrives.
Useful for product launch pages, wedding and conference countdowns, end-of-quarter goal trackers, kids waiting for a holiday, or anyone who wants a focus widget on a second monitor that quietly reminds them of an upcoming deadline.
How it works
The target moment is stored as an ISO 8601 timestamp, and the remaining duration is recomputed each tick from the current browser clock. Because the calculation uses absolute UTC instants under the hood, daylight-saving transitions in your local zone never cause the counter to skip or stall — the seconds-remaining figure decreases at a uniform rate regardless of civil-time wrinkles.
When the target time is reached the readout flips to a zero state, and on subsequent ticks it can optionally count up to show how long ago the moment passed. The tab title can also be updated each tick so the countdown is visible even when the page is in the background.
Examples
Target 2027-01-01 00:00:00 (local)
→ 227 days, 09:12:47 remaining
Target 2026-05-20 14:00 (60 minutes from now)
→ 00 days, 01:00:00
Target in 1.5 seconds
→ 00:00:01.500 — flips to "00:00:00" on next tick
FAQ
What happens when the countdown hits zero?
The display shows zeros and, if enabled, a chime plays. It can also continue counting upward so you see the elapsed time since the event.
Does it survive a tab refresh?
The target timestamp is kept in the URL or local storage, so reloading the page picks up exactly where the clock should be without resetting.
Can I count down to a date in another time zone?
Yes — enter the target along with its zone (for example a New York midnight while you sit in London) and the underlying UTC instant is shared regardless of where the page is viewed.
Why does the display sometimes jitter by a second?
The tick is driven by the browser's setInterval, which is throttled in background tabs. Switching back foregrounds the clock and the next tick snaps to the true remaining time.
Is there a maximum target distance?
Targets up to the year 9999 are supported, far beyond any practical countdown.