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Days between dates calculator

Count calendar days and working days between two dates, or add and subtract days, working days, weeks or months.

Calculate

Pick two valid dates.

Working days exclude Saturdays and Sundays only; public holidays are not taken into account.

For invoices and deadlines

Use it to count how long a project ran, how many working days to bill, or a delivery deadline. For payment terms such as Net 30 or end of month, the due date calculator also works out late fees.

Frequently asked questions

Does the count include the start and end dates?

By default it counts the days from the start date up to the end date, so 1 to 2 October is 1 day. Tick “Include the end date” to count both ends (2 days).

What counts as a working day?

Monday to Friday. Weekends are skipped, but public holidays differ by country and region and are not removed, so subtract them yourself if they matter.

What is 31 January plus one month?

The last day of February (28 or 29). When the target month is shorter, the date moves to that month's last day.