Who? Mark? He says the last supper was on the "first day of unleavened bread, when they sacrificed the passover lamb" which is Nisan 14 (Exodus 12:6)
The Feast of Unleavened bread is on the Thursday, the day before the crucifixion.
So you are right. The crucifixion occurs on Nisan 15.
The last supper on Nisan 14.
So what's the problem here? There's no discreprency. John is referring to the Friday, the feast of preparation. Matthew/Mark/Luke are referring to the feast of unleavened bread, the day before that. Two different days.
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