Use this Date Difference Calculator to count the calendar days between a start date and an end date. By default, the result excludes the end date, so it shows the number of days from the start date up to, but not including, the end date.
FAQ
How does the Date Difference Calculator work?
Enter a start date and an end date. The default result is the number of calendar days between them, with the end date excluded.
What does Include end date in calculation mean?
Checking this option adds the end date to the count. For example, 1 March 2026 to 15 March 2026 is 14 days by default and 15 days with the option selected.
What happens if I choose the same start and end date?
The same date is 0 days by default and 1 day when end-date inclusion is selected.
Does it handle leap years and special date rules?
The calculator handles leap days correctly. It does not calculate business days, weekends, public holidays, time zones, or time-of-day differences.