Tools
Countdown
Enter a target date and, if you want, a time. The calculator subtracts this device’s clock from that moment and shows whole days, leftover hours, minutes, and seconds. The numbers update every second.
Dates use month/day/year in the picker, with ISO YYYY-MM-DD underneath. A blank time is midnight on this device. If the target is already past, the result says so and shows how long ago that midnight or clock time was.
Set the target
Countdown questions
What clock is subtracted?
This device’s clock. Target minus now. The result updates every second.
How is a past date shown?
The heading says the moment has passed. The four numbers are how long ago that target was, using the same days-plus-leftover-hours rule.
When should I use the date difference calculator instead?
Use that page when you want a fixed span between two dates, such as January 1 to February 1 = 31 days. Use this page when you want the remaining time from now.