What's the difference between a countdown timer and a stopwatch?

A countdown timer counts down to a specific future date and time, while a stopwatch counts up from zero to measure elapsed duration.

Does the countdown stay accurate if I switch browser tabs?

A well-built countdown recalculates remaining time from the system clock on each update rather than just subtracting one second per tick, so it corrects itself even if the tab was inactive or throttled in the background.

Can I set a countdown to a specific date and time, not just a duration?

Yes, that's the core difference from a basic timer — a countdown timer targets an exact future date and time rather than a fixed duration like 10 or 25 minutes.

Countdown Timer

Set a live countdown to any event with progress tracking and sound alerts.

Event Name

Target Date & Time

Start Date (for progress bar)

Sound on completion

Saved Events

No saved events yet.

How to use

Enter an event name and target date/time, then click Start Countdown.
Set a start date for the progress bar to show how much time has elapsed.
The display turns yellow under 1 hour remaining and red under 10 minutes.
Enable Sound on completion to hear a beep when the timer reaches zero.
Click Save to store the event in your browser across visits.
Click Share to copy a URL with the target date pre-loaded.

About this Countdown Timer

A countdown timer tracks time remaining until a fixed future date and time, rather than counting up from zero the way a stopwatch does. It's the right tool whenever you're working toward a specific moment rather than measuring elapsed duration.

Countdown timer vs. stopwatch vs. kitchen timer

Countdown timer: counts down to a fixed date/time in the future, like a launch or event
Stopwatch: counts up from zero to measure how long something takes
Kitchen/interval timer: counts down a short, repeatable duration (10 minutes, 25 minutes) rather than to a specific calendar date

Why the target keeps ticking accurately

A well-built countdown recalculates the remaining time from the actual system clock on each update rather than simply subtracting one second per tick, which prevents the display from drifting out of sync if the browser tab is inactive, throttled, or the device goes to sleep briefly.

Common uses

Product launches, sale end times, and event start times
Wedding or vacation countdowns
Deadline tracking for a project or application
Live streams or broadcasts counting down to air time