Sadducees (who controlled the Temple and Judean Judaism) had a different interpretation of the timing of Passover, first day of unleavened bread (high Sabbath) 7th day of unleavened bread, First-fruit. Almost all the rest of Judaism worked on a Pharisee scheduled interpretation which started a day earlier. Nothing to do with our calendars, but interpreting the Mishnah. Another "division" among Sadducees/Pharisees that come to play throughout the NT.
Some try to make Jesus' eating NOT the Passover but seudah maphehket or special "last supper" that many Galileans had 24 hours before Passover. That flies in the face of so many places referring to this as Passover (it was "part" of Passover but not the seder itself)
Some try to make Jesus' eating NOT the Passover but seudah maphehket or special "last supper" that many Galileans had 24 hours before Passover. That flies in the face of so many places referring to this as Passover (it was "part" of Passover but not the seder itself)