a July 7 1964

07/07/1964 = 7+7+1+9+6+4 = 34 = 3+4 = 7

b. January 12, 1981

01/12/1981 = 1+1+2+1+9+8+1 = 23 = 2+3 = 5

c. December 21, 1945

12/21/1945 = 1+2+2+1+1+9+4+5 = 25 = 2+5 = 7