The general meaning is the same: all three sentences refer to the 24th of December. However, while the first two sentences mean more or less the same thing (substract one day from Christmas on the calendar and any day that matches that will do, it just happens there is only one), the third sentence singles out that particular day. Maybe one wants to put emphasis on how tragic it is to die on that particular day. Any of those sentences could replaces the others without loss of meaning.

I expect the 3