Countdown Timer
Live countdown to any future date and time in your browser.
Written by Golam Rabbani, Founder & Lead Engineer
How to use this countdown timer
- Pick a target date and time.
- Press Start to begin the countdown.
- Watch the live remaining time in days, hours, minutes, and seconds.
- Use Pause to freeze the display, Reset to clear the target, or Copy to share the time remaining.
About this countdown timer
A countdown timer tells you exactly how much time is left before a specific moment arrives, broken down into days, hours, minutes, and seconds. This one updates once every second, entirely inside your browser, with no page reloads or server calls needed.
When you enter a target date, a target time, and a time zone, the countdown timer converts your inputs into a single absolute timestamp — a UTC millisecond value — using the Intl.DateTimeFormat API to calculate the correct offset for your chosen zone. From that point on, each tick subtracts the current `Date.now()` from that fixed target and breaks the difference into the four display units. Because the calculation always works against the absolute target rather than decrementing a stored counter, the timer stays accurate even if your device sleeps: the next tick simply jumps to the mathematically correct value rather than drifting.
For example, if you set the target to 2026-12-31 at 23:59:59 in the Europe/London zone and start the countdown at 10:00 AM on 28 May 2026, you will see approximately 217 days, 13 hours, 59 minutes, and 59 seconds on the display, ticking down one second at a time. When the target instant passes, the display switches to "reached" mode so you know the event has arrived.
The tool suits anyone who needs a quick, reliable way to track time until a product launch, a deadline, a flight, or a celebration — without installing an app or creating an account.
FAQ
- Does the countdown survive a page reload?
- The target itself is held in component state, so reloading the page clears it. If you need a target that survives reloads, copy the date and re-enter it after refresh.
- How accurate is the tick?
- It updates once per second using setInterval. The displayed value always reflects the real remaining time computed from Date.now(), so even after a tab sleeps the next tick lands on the correct value rather than drifting.
- What happens when the target is reached?
- The display switches to elapsed mode and starts counting up from zero, so you can keep using the same timer for "time since launch" tracking.
- Does it support time zones?
- The target is interpreted in your browser's local time zone. If you need to count down to a specific instant in a different zone, convert that instant to your local time first using the time zone converter, then enter the result here.
- Is the countdown free?
- Yes. It runs entirely in your browser. There are no accounts, no rate limits, and nothing sent to a server.