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