Returns a number that represents a date that is the indicated number of working days before or after a date (the starting date). Working days exclude weekends and any dates identified as holidays. Use WORKDAY to exclude weekends or holidays when you calculate invoice due dates, expected delivery times, or the number of days of work performed.

'Declaration
 
Public Class CalcWorkdayFunction 
   Inherits CalcBuiltinFunction

'Usage
 
Dim instance As CalcWorkdayFunction

public class CalcWorkdayFunction : CalcBuiltinFunction