DAYS360

Description: Returns the number of days between dates that you specify, based on a 360-day year (twelve 30-day months), which is used in some accounting calculations. Use this function to help compute payments if your accounting system is based on twelve 30-day months.

Syntax: DAYS360(Start_date, End_date, [Method])

Start_date and End_date are the two dates between which you want to know the number of days. If Start_date occurs after End_date, DAYS360 returns a negative number. Dates should be entered by using the DATE function, or as results of other formulas or functions. For example, use DATE(2011,5,23) for the 23rd day of May, 2011. Problems can occur if dates are entered as text. For more information, see the NOW function.
Method is a logical value that specifies whether to use the U.S. or European method in the calculation.

Method	Defined
FALSE or omitted	U.S. (NASD) method. If the starting date is the 31st of a month, it becomes equal to the 30th of the same month. If the ending date is the 31st of a month and the starting date is earlier than the 30th of a month, the ending date becomes equal to the 1st of the next month; otherwise the ending date becomes equal to the 30th of the same month.
TRUE	European method. Starting dates and ending dates that occur on the 31st of a month become equal to the 30th of the same month.

Remarks:

The software stores dates as sequential serial numbers so they can be used in calculations. January 1, 1900 is serial number 1, and January 1, 2011 is serial number 40544 because it is 40,544 days after January 1, 1900. For more information, see the NOW function.

Example:

DAYS360("1/30/2011", "2/1/2011") = 1 [the number of days between the two dates, based on a 360-day year]