Method
How the countdown calculator works
The target is interpreted in the browser’s local time zone and compared with the current browser clock.
Counting clock time within a day rather than calendar days? The hours calculator measures the hours and minutes between two times, the time card calculator totals a week of shifts, the add time calculator adds or subtracts durations, and the military time converter switches between 24-hour and AM/PM times. The rest are in the time calculators collection.
Example
Countdown calculator example
The result updates when recalculated; it is a browser-clock estimate rather than a synchronized time service.
FAQ
Countdown calculator FAQ
Which time zone is used?
The browser’s current local time zone.
Does the countdown update continuously?
It refreshes once per minute while the page remains open.
What happens after the target?
The result states how much time has elapsed since the target.