Gregorian - Sunday-based, week 40, 3 month
     September 2013            October 2013            November 2013     
   Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa
36  1  2  3  4  5  6  7  40        1  2  3  4  5  44                 1  2
37  8  9 10 11 12 13 14  41  6  7  8  9 10 11 12  45  3  4  5  6  7  8  9
38 15 16 17 18 19 20 21  42 13 14 15 16 17 18 19  46 10 11 12 13 14 15 16
39 22 23 24 25 26 27 28  43 20 21 22 23 24 25 26  47 17 18 19 20 21 22 23
40 29 30                 44 27 28 29 30 31        48 24 25 26 27 28 29 30