I have the below list of days, and numbers corresponding to each day. I am trying to group the dates into weeks, with a total number for each week instead of each day. Is there any way to accomplish this?

03-Jan-12 Count 168
04-Jan-12 Count 193
05-Jan-12 Count 175
06-Jan-12 Count 101
09-Jan-12 Count 119
10-Jan-12 Count 64
11-Jan-12 Count 82
12-Jan-12 Count 68
13-Jan-12 Count 45
16-Jan-12 Count 115
17-Jan-12 Count 33