A picture of A.D. 31 Passover calendar shows it was on a Monday, (The Crucifixtion), not Friday.
Scripture states it was the preparation day, or the 6th day of the Biblical week. Passover occurs of course on the 14th day of the first moon-month, or rather the night following the 14th day (light portion), of the moon.

This calendar shows New Moon to be on the 10th day of the pagan calendar, meaning the 14th day, Passover, is on the 23rd day of the pagan calendar, a Monday, the Gregorian calendar is new and is not Scriptural.