Countdown Timer

What countdown timers are for

A countdown timer turns a future date into a live, ticking visual. People use them for big personal milestones (weddings, holidays, birthdays), work deadlines, retirement dates, sports events, exam dates, product launches, and just for the small motivational lift of watching the seconds tick down to something good.

How this one works

Pick any future date and time. The display updates every second, showing days, hours, minutes, and seconds remaining. The math is straightforward — the difference between the target moment and the current moment, broken into units. The browser's clock drives the timer, so accuracy matches your computer's clock, which is typically kept in sync with atomic-clock time over the internet to within a fraction of a second.

If the target date is in the past, the timer flips to count up instead: "happened 3 days, 4 hours ago." The numbers stay accurate; the label changes. Useful for tracking time since an event — a sobriety milestone, a product launch anniversary, the start of a relationship.

Sharing a countdown

The "Copy share link" button copies the current URL with your countdown encoded in it. When someone opens that link, they see the exact same countdown ticking in real time on their device — no account, no installation, no data sent to any server. The title and target date are stored entirely in the URL itself. This makes it easy to share a countdown to a friend's birthday, a team project deadline, or a public launch date.

Tips

• Time zones. The target date and time are interpreted in your local time zone. If you share the countdown with someone in another country, the remaining time will be the same number on both ends — because it's the difference to a fixed absolute moment.
• Saved automatically. Your title and target date are remembered in your browser between visits — close the tab and come back to the same countdown.