In 
                a Date Magic square, the date of birth: 22-12-1887 is written 
                as four numbers in four squares.
                
              The 
                following are sequences of pairs of numbers in square boxes:
               
                 
                  22 + 87 = 27 + 82 (a choice)
                  12 + 18 = 4  + 26  (a choice)
                    4 + 87 = 84 + 7  (a choice)
                  22 + 26 = 16 + 32 (a choice)
                    4 + 22 = 24 + 2  (a choice)
                  
              
               
                2nd row: 
                
                139 - 84 - 32 - 2 = 21 
                139 - 16 - 7 -24 = 92.