|Excel Developer Reference|
expression.NetworkDays(Arg1, Arg2, Arg3)
expression A variable that represents a WorksheetFunction object.
|Arg1||Required||Variant||Start_date - a date that represents the start date.|
|Arg2||Required||Variant||End_date - a date that represents the end date.|
|Arg3||Optional||Variant||Holidays - an optional range of one or more dates to exclude from the working calendar, such as state and federal holidays and floating holidays. The list can be either a range of cells that contains the dates or an array constant of the serial numbers that represent the dates.|
Important Dates should be entered by using the DATE function, or as results of other formulas or functions. For example, use DATE(2008,5,23) for the 23rd day of May, 2008. Problems can occur if dates are entered as text.
- Microsoft Excel stores dates as sequential serial numbers so they can be used in calculations. By default, January 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39,448 days after January 1, 1900. Microsoft Excel for the Macintosh uses a different date system as its default.
- If any argument is not a valid date, NETWORKDAYS returns the #VALUE! error value.