DAYS360
Category: DateTime Function.
Description: Returns the number of days between two dates, based on a 360-day year (twelve 30-day months).
Syntax: DAYS360(start_date,end_date,[method])
Start_date and end_date are two dates between which you want to know the number of days.
Dates should be supplied as cell references, or as results of the DATE or other function that returns a sequential serial number representing a particular date.
Method is a logical value that specifies whether to use the US (NASD) method (if set to True) or European method (if set to False) in the calculation.
If the method argument is omitted, the NASD method is used.