What it does
Enter any future date and time to see a live countdown in days, hours, minutes and seconds. The display updates every second — no refresh required, and nothing is sent to a server.
Common uses
- Events — counting down to a wedding, concert, or product launch.
- Deadlines — keeping a submission, tax, or project deadline visible.
- New Year — a classic midnight countdown in any time zone.
- Personal milestones — a birthday, anniversary, or holiday.
How it works
The tool reads the target date and time you enter and subtracts the current moment from it every second using setInterval. The difference in milliseconds is converted to whole days, hours, minutes and seconds using integer division. When the target moment passes, all fields show zero and a brief message confirms the event has passed.
A note on time zones
The datetime picker uses your browser's local time — the same clock your device shows. If you and your audience are in different time zones, enter the target time as it would appear on a clock at your location. Most personal use cases (a birthday at midnight, a local event) work naturally this way.
Precision
The countdown ticks once per second, so it is accurate to within roughly one second at any given moment. For most event and deadline use cases this is more than sufficient.
Frequently asked
What happens when the target time passes?
All segments display zero and a short message reads "Event has passed". The timer keeps running so you can immediately pick a new target without refreshing.
Can I bookmark the page with a specific target date?
Not currently — the target date is set in the browser and is not saved to a URL. Re-enter your target each visit, or leave the tab open.
Does this work offline?
Yes. Once the page has loaded the countdown runs entirely in your browser. No network connection is needed for the ticking itself.