Date Difference Calculator
Counts the days between two dates, and separately the weekdays, which is the figure you usually want for project deadlines and notice periods. Reversing the dates is fine — it counts the gap either way.
Your inputs
Your result
Formula
Days, and working days
Total days is a simple count. Working days excludes Saturdays and Sundays, which is what most contracts, notice periods and delivery estimates actually mean when they say days.
Public holidays are not deducted, because they vary by country, state and sometimes by employer. If your calculation depends on them, subtract the relevant ones from the working-days figure yourself.
Inclusive or exclusive counting
This counts the gap between the dates, so 1 January to 2 January is one day. If a rule counts both the first and last day — some notice periods and rental agreements do — add one to the result. Getting this wrong by a day is the most common error in date arithmetic.
Whole months are approximate by nature
The months figure counts complete calendar months, with any remaining days shown in the calendar difference. Because months differ in length, a fixed number of days does not map cleanly onto months, and any tool claiming otherwise is rounding.
Frequently asked questions
How many working days between two dates?
Count only Monday to Friday. The figure above does this, but does not deduct public holidays, which differ by location.
Does it include both the start and end date?
No. It counts the gap between them. Add one if your rule counts both endpoints.
Are leap years handled?
Yes. The count is a genuine calendar count, so 29 February is included whenever it falls inside the range.