This article describes the formula syntax and usage of the DAYS function in Microsoft Excel. For information about the DAY function, see DAY function.
Returns the number of days between two dates.
The DAYS function syntax has the following arguments.
- End_date Required. Start_date and End_date are the two dates between which you want to know the number of days.
- Start_date Required. Start_date and End_date are the two dates between which you want to know the number of days.
Note Excel stores dates as sequential serial numbers so that they can be used in calculations. By default, Jan 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39447 days after January 1, 1900.
- If both date arguments are numbers, DAYS uses EndDate–StartDate to calculate the number of days in between both dates.
- If either one of the date arguments is text, that argument is treated as DATEVALUE(date_text) and returns an integer date instead of a time component.
- If date arguments are numeric values that fall outside the range of valid dates, DAYS returns the #NUM! error value.
- If date arguments are strings that cannot be parsed as valid dates, DAYS returns the #VALUE! error value.
The workbook below shows examples of this function. Inspect them, change existing formulas, or enter your own formulas to learn how the function works.
To work more in-depth with the example data in Excel, download the embedded workbook to your computer, and then open it in Excel.
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