正如你所引的《马可》所言：‘Preparation Day (that is, the day before the Sabbath）’，印证了敝帖所说的马可的时间，即耶稣死于星期五。

the preparation day for the sabbath is NOT the preparation day for the passover.

the preparation day for the sabbath is Friday, to prepare the meals for Saturday (which starts at the nightfall of the Friday in our calendar).

the preparation day for passover is Thursday, to prepare the passover meal (which will take place after the nightfall of the thursday in our calendar).

in Mark, Jesus died on the preparation day for the sabbath.

in John, Jesus died on the preparation day for the passover.