Countdown Timer
Count down to birthdays, holidays, deadlines, and events. Live timer with days/hours/minutes/seconds. Save multiple countdowns in your browser.
How to use Countdown Timer
The countdown timer creates persistent event countdowns that tick live in your browser. Add named events with a target date and optional time; each event shows days, hours, minutes and seconds remaining and persists across page refreshes via local storage. Use it to track project deadlines, birthdays, product launches or any future milestone.
- Enter an event name (optional) and select a target date and time.
- Click Add Event to start the countdown.
- View live-ticking countdowns for all your events.
- Delete individual events when no longer needed.
Your data never leaves your device — 100% private processing.
How the countdown is stored
Event data is saved to your browser's localStorage, meaning events persist when you close and reopen the page without requiring an account. Data stays on your device and is not sent to any server. Clearing browser storage or switching devices will remove stored events.
Glossary
- localStorage
- Browser storage that persists data indefinitely on the same device and browser.
- Unix timestamp
- A single number representing a point in time, used for accurate countdown arithmetic.
Related reading
Frequently Asked Questions
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Why use Countdown Timer?
- Handles timezone conversions and DST automatically
- Supports date arithmetic across years and leap years
- ISO 8601 and human-readable output formats
- Works for historical and future dates with full accuracy
Common use cases
- Calculate how many days until a project deadline
- Find the day of the week for a date in the past
- Convert meeting times across different time zones
- Calculate age from a date of birth
- Add or subtract business days for contract terms
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