How the days between dates calculator works
The calculator converts both dates to calendar days and subtracts them, so leap years and month lengths are handled automatically.
Weekdays = days that fall Monday to Friday
By default the result is the difference, which counts the start date but not the end date: from Monday to Friday is 4 days. Choose inclusive counting to include both dates, which is how many contracts and leave policies count. Weekdays exclude Saturdays and Sundays but not public holidays, so subtract holidays that fall in the range for a business-day count.
Worked example
From January 1, 2026 to December 31, 2026 is 364 days (52 weeks), or 365 if you include the end date. 260 of those days are weekdays. Expressed in calendar units, the span is 11 months and 30 days.
Frequently asked questions
How do I count days between two dates?
Subtract the earlier date from the later one. Add one if both dates should be counted.
Does this account for leap years?
Yes. February 29 is counted whenever it falls in the range.
What counts as a business day?
Monday to Friday. Public holidays are not removed automatically.
How many weeks are in a year?
52 weeks and 1 day, or 2 days in a leap year.
Updated October 2026. Results are estimates for education, not financial or medical advice. All math runs in your browser; nothing you type is sent anywhere.