Your not giving any cell reference.
This function will calculate the number of working days between two dates.
It will exclude weekends and any holidays.
Holidays : This is a list of dates which will be excluded from the calculation, such as Xmas.
A1 B1 C1
C30:C42 is a list of holiday dates you would type in.
functions show #NAME if the Analysys
Toolpak is not installed.