It was the preparation - that is, the day before the Jewish sabbath.
and about the sixth hour - The true reading here is probably, “the third hour” - or nine a.m. - which agrees best with the whole series of events, as well as with the other Evangelists.
he saith to the Jews, Behold your King! - Having now made up his mind to yield to them, he takes a sort of quiet revenge on them by this irony, which he knew would sting them. This only reawakens their cry to dispatch Him.