Looking for a number of days between two dates calculator? This free tool gives you days between dates, or add and subtract days from any date. Just enter your numbers and press Calculate — results are instant.
Counting days between dates is easy to get wrong by hand because months have different lengths and leap years add a day. This calculator takes two dates and gives the exact difference in days and weeks, and tells you which date comes first. In add mode it moves a start date forward or backward by the number of days you give — handy for deadlines, due dates and planning.
Example: Date 1: 1 January 2026 · Date 2: 31 December 2026 · Days between dates
Difference: 364 days
No. The calculator counts the days between the two dates, not including the start date — so 1 January to 2 January is 1 day, not 2.
By the real calendar: 29 February counts when it falls between your dates. The calculator uses actual calendar dates, so leap years are handled automatically.
For moving a date forward or backward: a deadline 90 days from today, a due date, a reminder. Enter a negative number to go backwards.