Easter Sunday is celebrated as the day of Jesus' resurrection and rightly so; it is a practical unifying moment. Yet in fact the Lord may have been resurrected just before dusk on Saturday. Interestingly he may have been crucified on a Wednesday instead of a Friday. The video below explains the timeline persuasively.
To summarize; the day after Passover was a Jewish 'High Day' and an annual sabbath. Therefore there was the week of Jesus' crucifixion and resurrection, two sabbath days. He was actually in the tomb three full days and nights fulfilling his statement that the evil generation would be given no signs except for that of Jonah where the man was three full days and nights incarcerated in a whale.
https://youtu.be/EmtyYqq11Qc?si=_bJQ8zp4EhPhuoHz
