Days Between Dates Calculator
Count the days between two dates, and see the result in weeks, months and business days.
How days between dates are counted
The calculator counts calendar days from the start date to the end date. From January 1 to January 31 is 30 days; tick "include the end date" to count both ends (31 days), which is how you count the days of a trip or a hotel stay including departure.
Business days count Monday to Friday. Weeks are 7 days, and months are shown as whole calendar months plus the remaining days.
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Frequently asked questions
Do you count the start and end dates?
By convention the result counts the days from the start date up to, but not including, the end date: from Monday to Friday is 4 days. Tick "include end date" to count both days, which gives 5.
How are business days counted?
Business days here are Monday to Friday. Public holidays are not subtracted, because they differ by country.
How many days are in a year?
365 days, or 366 in a leap year. Leap years are divisible by 4, except century years not divisible by 400: 2000 and 2024 are leap years, 2100 is not.