Returns the number of days between two dates based on a 360-day year
[C++]
static int Days360(
   double& ddays,
   long start_date,
   long end_date,
   bool european_method = false
);
static int Days360(
   long& ldays,
   long serial_number,
   long start_date,
   long end_date,
   bool european_method = false
);
A reference to a value that will contain a day count if the function succeeds.
An Excel serial date value.
An Excel serial date value.
True for european day count method; false for the US method.
A reference to a value that will contain a day count if the function succeeds.
Zero if the function has been called successfully; non-zero
            if the function could not be called.
            See Error codes for a list
            of return values.
See the Microsoft Excel on-line Help for full details about
            this function.
Header: xlfuncs.h