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Excel DAYS360 Function

You are here: Home / Excel Functions / Excel DAYS360 Function

The Excel DAYS360 function returns the number of days between two date serial numbers based on a 360-day year, or twelve 30-day months. This method is used in some accounting calculations.

Excel DAYS360 Function Syntax

Syntax: =DAYS360(start_date, end_date, [method])
start_date A date in a format Excel recognises known as the date-time serial number, or text
end_date A date in a format Excel recognises known as the date-time serial number, or text
[method]  Optional logical value TRUE/FALSE – see more below.
 

The optional 'method' argument is a logical value (TRUE/FALSE) that specifies whether to use the U.S. or European method. If omitted it is treated as FALSE.

FALSE: U.S. (NASD) method. If the starting date is the last day of a month, it becomes equal to the 30th day of the same month. If the ending date is the last day of a month and the starting date is earlier than the 30th day of a month, the ending date becomes equal to the 1st day of the next month; otherwise the ending date becomes equal to the 30th day of the same month.

TRUE: European method. Starting dates and ending dates that occur on the 31st day of a month become equal to the 30th day of the same month.

Excel DAYS360 Function Examples

Excel DAYS360 Function

emoticon Notice the difference between the TRUE/FALSE method results.

Tip: DAYS360 works with dates stored as text (cells B27 & B35), but this is not reliable. It's always best to work with date serial numbers.

Note: Only the date portion of a date-time serial number is used by DAYS360. Any time element is ignored. As a result, only whole days are returned.

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Related Tutorials

Excel NETWORKDAYS Function Returns the number of whole networkdays (excluding weekends & holidays), between two dates
Excel NETWORKDAYS.INTL Function Returns the number of whole networkdays (excluding weekends & holidays), between two dates, using parameters to specify weekend days
Excel DAYS Function Calculates the number of days between 2 dates
Excel DATEDIF Function Calculates the number of days, months, or years between two dates. This function is useful in formulas where you need to calculate an age.
Excel YEARFRAC Function Calculates the fraction of the year represented by the number of whole days between two dates

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