Ysahme
Assuming your dates are mm/dd/yy above
1/2/13 to 1/12/13 is 11 days of which there is 1 Sundays
So I get 11 not 10 as you posted
I would use: =NETWORKDAYS.INTL(A2,B2,11)
1/8/13 to 1/12/13 is 5 days of which there are no Sundays
So I get 5 not 4 as you posted
I would use: =NETWORKDAYS.INTL(A3,B3,11)
My counts above include both the Start and End dates so you can take off another 1 or 2 if they aren't included
So the formula could be:
=NETWORKDAYS.INTL(A2,B2,11)-1
to match your answers