Date Difference Calculator

A date difference calculator counts the time between two dates in days, and breaks it down into years, months and days, weeks, and working weekdays. It saves counting across months of different lengths and leap years.

It's useful for deadlines and notice periods, the days left in a project, the length of a loan or rental agreement, the number of working days in a sprint, or the gap between two events. The second panel does the reverse: add or subtract a number of days from any date, as when a form says "within 45 days of the invoice".

The total is the number of midnights between the two dates, so 1 to 2 March is one day. Inclusive counting adds one, which is what you want when both dates are working days of a leave request.

Weekdays counts Monday to Friday only, without public holidays, which vary by country and state. The years, months and days breakdown follows the calendar, so a span that starts on 31 January moves through February correctly.