Hi,
I guess you mean the number of weekdays (or working days) excluding Saturdays and Sundays. So start a spreadsheet and put the start date (28/10/2013) in A2 and the end date (11/11/2013) in B2.

Then paste the formula below into C2:

=B2-A2-2*INT ((B2-A2+WEEKDAY (A2, 3))/7)-MAX (0, WEEKDAY (B2, 3)-4


Thanks, I hope it works for you.....