How to count the days between two dates
Count the days from the start date up to the end date. By default the start date is counted and the end date is not, so 1 March to 8 March is 7 days. Turn on Include end date to count both, which gives 8.
Weekdays are Monday to Friday and weekend days are Saturday and Sunday. Each full week adds 5 of one and 2 of the other; the days left over are checked one by one.
Examples you can open and check
Each link loads fixed dates into the calculator above and calculates the result. Count the listed dates to check the answer. Weekdays mean Monday to Friday; holidays are not removed.
- Friday to Monday: leave out Monday
October 23–26, 2026. Count Friday 23, Saturday 24 and Sunday 25: 3 days = 1 weekday + 2 weekend days.
- Friday to Monday: count both dates
Use the same dates and include the end date. Add Monday 26: 4 days = 2 weekdays + 2 weekend days.
- Friday to Saturday: which date is counted?
October 23–24, 2026, with the end excluded. Count Friday 23 only: 1 day = 1 weekday + 0 weekend days. The total alone does not tell you which date was counted.
View the loaded example in the calculator
Matching dates give 0 days with the end excluded, or 1 day with it included. Choose the rule your task requires; this tool does not determine legal deadlines.
Leap-year check, end excluded: 2000-02-28 → 2000-03-01 counts February 28 and 29, giving 2 days. The same dates in 1900 give 1 day, February 28. Years divisible by 100 are leap years only when also divisible by 400.
From weekdays to actual working days
Weekdays here always mean Monday to Friday, not a regional attendance calendar. To adjust manually, subtract weekday dates that are days off and add weekend dates that are working days, within the selected interval. Check your region's or employer's authoritative calendar.
Hypothetical adjustment: in the four-day Friday–Monday example, if Friday is a day off and Saturday is a make-up working day, start from 2 weekdays, subtract 1 and add 1: 2 actual working days. This illustrates the adjustment only, not any country's holiday schedule.