Number Theory Linking Zodiac Murder Dates

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Looking at the 4 dates starting with 12/20/68, equals 100 and starts the pattern. I wonder, now, if the possible fives and tens number theory paralleled, or so, the 4 holiday or otherwise holiday-type days: Christmas, Valentines Day, July 4th, and Halloween. 12/25/68 (12+25+68=105) 2/14/69 (2+14+69=85) 7/4/69 (7+4+69=80) 10/31/69 (10+31+69=110). Keep in mind that you have 0 and 5 out of (0,1,2,3,4,5,6,7,8,9) possibles, 1 in 5 chance.