Gregorian - Sunday-based week with week numbers
     September 2006    
   Su Mo Tu We Th Fr Sa
35                 1  2
36  3  4  5  6  7  8  9
37 10 11 12 13 14 15 16
38 17 18 19 20 21 22 23
39 24 25 26 27 28 29 30