Julian    - Monday-based year with weeks
      January 2147483646      
   Mon Tue Wed Thu Fri Sat Sun
 1   1   2   3   4   5   6   7
 2   8   9  10  11  12  13  14
 3  15  16  17  18  19  20  21
 4  22  23  24  25  26  27  28
 5  29  30  31