Julian - Monday-based year with week numbers
         January 1752         
   Mon Tue Wed Thu Fri Sat Sun
 1           1   2   3   4   5
 2   6   7   8   9  10  11  12
 3  13  14  15  16  17  18  19
 4  20  21  22  23  24  25  26
 5  27  28  29  30  31        
                              
