Date Difference Calculator
Measure the exact span between two date-times. Enter start and end dates with times to see days, hours, minutes, and seconds.
Enter start and end date-times to see the difference.
How it works
Each date and time is combined as a UTC instant. The result breaks the absolute difference into non-overlapping days, hours, minutes, and seconds (for example, 1 day 3 hours is shown as 1 day and 3 hours, not 27 hours).
If the end is before the start, the calculator still shows the length of the gap. For calendar days only (ignoring time of day), use Days Between Dates. To count down to a future moment, try the Countdown Timer.