Im trying to summarise the number of NETWORKDAYS spent on projects by month.
The data I have is as follows: (dates are in UK format)

A B C
1 Project Name Start Finish
2 Project One 22/02/2008 13/03/2008
3 Project Two 22/02/2008 06/03/2008
4 Project Three 25/02/2008 11/03/2008
5 Project Four 25/04/2008 12/05/2008
6 Project Five 09/05/2008 06/06/2008
7 Project Six 13/05/2008 27/05/2008

The result I am looking for should look like this:

9 Month Number of Days
10 January 2008 0
11 February 2008 17
12 March 2008 20
13 April 2008 4
14 May 2008 35
15 June 2008 22

I have tried various combinations of arrays using SUM, SUMIF etc but cannot
find a solution. Any advice would be appreciated.

Many thanks in advance.