Go into the VBA editor (Alt+F11), click Insert/Module on its menu bar and
Copy/Paste this code into the code window that appeared...
Function DateAddWorkDays(ByVal StartDate As Date, WorkDays As Long) As Date
If Weekday(StartDate) = 1 Then StartDate = StartDate - 1
DateAddWorkDays = DateAdd("d", 7 * (WorkDays \ 6) + (WorkDays Mod 6) - _
((WorkDays Mod 6) > 7 - Weekday(StartDate)), StartDate)
If this is new to you, what you just did is create a user function which can
now be used just like any normal, built-in worksheet function within a
worksheet formula. To see this, using your example, go back to your
worksheet and put this formula in A3...
It should show, depending on how A3 is formatted, the date April 10, 2008.