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How to Use The Excel DAYS360 Function

Sometimes in accounting calculations, we need to calculate days between two dates based on a 360-days calendar year, twelve 30-day months. Therefore, the Excel DAYS360 function is used to return the number of days between two dates based on 360 days calendar year

Figure 1. Using the Excel DAYS360 Function


The syntax for the Excel DAYS360 function is;



  • start_date and end_date arguments are used to calculate the difference between two dates as the number of days.


  • Method argument is optional and used to choose the US or European method. TRUE is selected for European and FALSE for the US method. The default method is the US method if omitted.


Figure 2. The Syntax for the Excel DAYS360 Function


In our example, we have a table containing the start dates and the ending dates in a format supported by the Excel and we want to calculate the number of days between two dates as per the default US method. The Excel DAYS360 function calculates the number of days between two days in the following formula in cell D2;


Copy this formula down to other cells in column D.

Figure 3. Calculating Days Between Dates With Excel DAYS360 Function

Usage Notes for Excel DAYS360 Function

  • It returns the #NUM! error if the start_date or end_date is a numeric value but not a valid date value.
  • If we enter the start date or end date argument as a text value that cannot be represented as a date value then the function returns the #VALUE! error.

Figure 4. An Error Value of Excel DAYS360 Function

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Another blog reader asked this question today on Excelchat:
Here are some problems that our users have asked and received explanations on

I have a formula for one cell that has a solution. But, I have another function to be added to change the value of that cell. 1. One cell has a date 7/3/17 2. Another cell (with the formula): =IF(G134<>"",DAYS360(G134,TODAY(),),"") displays the number of days 66 which is attached to another cell displaying the monetary value. 3. I have another cell 7/6/17 and which that is displayed I need this to show the difference between that cell and the cell with the date of 7/3/17, to which I want it to show in the cell that has the 66 to now display 3 or the difference.
Solved by C. J. in 14 mins

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