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Excel Functions

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MS Excel: DAYS360 Function (WS)

Learn how to use the Excel DAYS360 function with syntax and examples.


The Microsoft Excel DAYS360 function returns the number of days between two dates based on a 360-day year.


The syntax for the Microsoft Excel DAYS360 function is:

DAYS360( start_date, end_date, [method] )

Parameters or Arguments

start_date and end_date are the two dates to calculate the difference between.

method is optional. It is a boolean value - either TRUE or FALSE. If TRUE is entered, the DAYS360 function will use the US method. If FALSE is entered, the DAYS360 function will use the European method.

Applies To

The DAYS360 function can be used in the following versions of Microsoft Excel:

  • Excel 2013, Excel 2011 for Mac, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000

Type of Excel Function

The DAYS360 function can be used in Microsoft Excel as the following type of function:

  • Worksheet function (WS)

Example (as Worksheet Function)

Let's look at some Excel DAYS360 function examples and explore how to use the DAYS360 function as a worksheet function in Microsoft Excel:

Microsoft Excel

Based on the spreadsheet above, the following Excel DAYS360 examples would return:

=DAYS360(A1, A2, TRUE) would return 359
=DAYS360(A3, A2, TRUE) would return 15
=DAYS360("30-Nov-2012", "1-Dec-2012") would return 1