Date and Time - WeekendDays

Syntax:
=WeekendDays(Date1, Date2 [, Weekend] )

Description:
Return the number of weekend days in the date interval.

Date1, Date2 : the date interval considered.
Weekend : Optional parameter to define the weekend. 1=Saturday and Sunday, 2=Sunday only

Example:
=WeekendDays(A1,A2)
=WeekendDays("01/June/2006","15/June/2006")