Julian    - Monday-based, week 53, 1 month
         January 2010         
   Mon Tue Wed Thu Fri Sat Sun
53                   1   2   3
 1   4   5   6   7   8   9  10
 2  11  12  13  14  15  16  17
 3  18  19  20  21  22  23  24
 4  25  26  27  28  29  30  31