pierrot 14:
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I noticed an unusual occurrance in that calender. The date of Immaculate Conception is 8/12/… The date of Christmas Day, which we all know is when he was reputedly born 25/12/…
Now as far as I’m aware, the normal gestation period for a human baby is 9 months, a 17 day fetus is barely classed as viable and will not survive birth. So Mary must have carried him for 12 months and 17 days, OR, someone got their sums wrong. 
P.S. Yes, I do know the reason these dates don’t add up 