How? According to not acknowledging Mark 14:12-16 to be the 14th of Nisan per Exodus 12:18.
The three fold evidence of the resurrection of Christ
Mere denials or counter claimes do not refute truth.
Commonly claimed dates for Nisan 14th crucifixion.
Julian date Friday April 7, 30 A.D.
Julian date Friday April 3, 33 A.D.
Julian date Wednesday April 5, 30 A.D.
Only one of those dates can be right or none of those are not correct.
At issue Mark 14:12, And the first day of unleavened bread, when they killed the passover, his disciples said unto him, Where wilt thou that we go and prepare that thou mayest eat the passover?
It being understood to be the afternoon of the 14th of Nisan.