BIDS subtracting two dates

Hello,

I am querying two columns, date1 and date2 from the same dataset. I want to subtract date2 from date1. BUT i want to EXCLUDE weekend hours, and off business hours. So i only want to calculate  the total business hours from date2 minus date 1.

Lets say business hours are 7-6. Is this possible in BIDS?

Im using Visual Studio 2008, and using a report project.

Thanks for the help.