Date Change MM/DD/YYYY & 3-Work Day Weekly Repeat

In MS-Excel 2007 dates seem to be limited to YYYY/MM/DD style, which I imagine there is a way to alter it into MM/DD/YYYY. I looked into MS Help, and a google search, and either I was using wrong keywords, or not, but I couldn't find anything to simply change date arrangement. If I am being unclear, I am talking about the function '=DATE(YYYY/MM/DD)' is what I want to change.

After I get that fixed, I need there to be a function to reproduce a 3-day work week (Mon, Tue, and Thur). e.g.:

10/05/09 [data] [data] [data]
10/06/09 [data] [data] [data]
10/08/09 [data] [data] [data]
Week 1 [data sum] [data sum] [data sum]

10/12/09
10/13/09
10/15/09
Week 2

10/19/09
10/20/09
10/22/09
............................