Countdown Timer
Count down to any date, or use as a stopwatch.
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How to Set Up a Countdown
- Name your event. Type a label like "Wedding Day" or "Product Launch" so the countdown is easy to recognize at a glance.
- Pick the target date and time. Use the date/time picker — the tool accepts any date, including ones already in the past.
- Watch it update live. Days, hours, minutes, and seconds recalculate every second automatically. No refresh needed, and nothing is saved or sent anywhere.
Popular Uses for a Countdown Timer
- Holidays: New Year's Eve, Christmas, Thanksgiving, Halloween
- Personal milestones: Birthdays, anniversaries, graduations, retirements
- Work deadlines: Project due dates, exam dates, launch days
- Sports events: World Cup, Olympics, match days
- Product launches: App releases, sales, pre-orders
- Travel: Vacation departure, return date
How Time Is Calculated
The countdown calculates the exact difference between right now (updated every second) and your target date. Days = total remaining seconds ÷ 86,400. Hours = remaining seconds after removing full days ÷ 3,600. Minutes = remaining seconds after removing hours ÷ 60. Seconds = the final remainder.
Worked example: if 3,725 seconds remain, that's 3,725 ÷ 3,600 = 1 hour (3,600s used, 125s left), then 125 ÷ 60 = 2 minutes (120s used, 5s left) — so the display reads 0 days, 1 hour, 2 minutes, 5 seconds.
Countdown Timer vs. Stopwatch — When to Use Each
A countdown timer counts down to a fixed future (or past) date and time — use it for events you're waiting for. A stopwatch counts up from zero and measures elapsed time — use it for timing something happening right now, like a workout, a presentation, or a cooking step. This tool includes both, switchable with the tabs above.
Quick Reference: Common Time Conversions
| Unit | Equivalent |
|---|---|
| 1 day | 24 hours · 1,440 minutes · 86,400 seconds |
| 1 week | 7 days · 168 hours |
| Common month | 28–31 days (February is 28, or 29 in a leap year) |
| 1 calendar year | 365 days (366 in a leap year) |
| Leap year rule | Divisible by 4, except century years unless divisible by 400 (2024 and 2028 are leap years; 2100 will not be) |
Frequently Asked Questions
Set the tool to December 25, 2026 — it will show the exact days, hours, minutes, and seconds remaining in real time. Or click the Christmas quick button above.
The countdown target date is not saved between sessions. If you close the browser and reopen, you need to re-enter the date. The timer is calculated fresh from your target date each time.
The stopwatch uses JavaScript's performance.now() which is accurate to sub-millisecond precision. Display refresh is every 100ms so the displayed value rounds to 0.1 seconds.
Yes — the timer uses your device's local time zone automatically. If you share the page with someone in another time zone, they should enter the target date and time in their own local time for it to match the same real-world moment.
Yes. Set your event name and end time, then keep the browser tab open — the display updates every second and works well projected on a screen for talks, streams, or livestreams.
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