Matthew, Mark and Luke claim that Jesus died on passover (Nisan 14) John, however, claims that Jesus died on the day of preparation for passover (Nisan 13) "Now it was preparation of the passover" -John 19:14 NWT (It helps to read the context, several verses before and after.) John also doesn't mention the Lord's evening meal with his his apostles on passover. It would have been impossible, because he was already dead, according to John.
The Bible contains many contradictions that can possibly be reconciled if you have enough imagination, but this contradiction seems pretty blatant. I don't know how a JW could overcome it. It seems to shatter a fundamental aspect of JW theology and is pretty damaging to other religions as well. The JW's only have one holiday every year and one gospel account indicates that it has no justification.
What are your thoughts on this?