Countdown Calculator
Choose a future or past date and time to see days, hours, minutes, and seconds.
A QUICK WALKTHROUGH
How to use this tool
- Choose a target date and time.
- Calculate using your browser clock and local timezone.
- Read the signed difference.
Your local timezone
The date-time field and current time use the browser’s local timezone; daylight-saving transitions are handled by Date.
Past targets
Past dates show a negative signed duration rather than being rejected.
GOOD TO KNOW
Common questions
Does this use UTC?
No. Input and display use the user’s browser local timezone.
Does it update continuously?
Calculate again to refresh the current-time difference.