Not all sabbaths fall on Saturday. There are sabbath that can fall on any day of the week.
It allows three days and three nights if he died on a Wednesday afternoon and was buried at the beginning of Thursday three days and three nights exactly before Mary magdalene comes to the tomb he resurrected at the end of Saturday, on that particular event. That why the belief of the catholic church that the on Friday. Is not true it is not biblical and all the rituals the eating of meat is not allowed on. These are crazy teachings because they are not biblical.
Matthew 28 verse 1 says, in the end of the sabbath, as it began to dawn toward the first day of the week, came Mary Magdalene and the other Mary to see the sepulcher.
Chapter 28 verse 2 says, And behold, there was a great earthquake for the angel of the lord descended from heaven, and came and rolled back and stone from the door, and sat upon it.
28 verse 3 says, His countenance was like lightening, and his raiment white as snow.
28 verse 4 says, And for fear for him, the keepers did shake, and became as dead man.
28 verse 5 says, And the angel answered and said unto the woman fear not ye for I know that ye seek jesus, which was crucified.
28 verse 6 says, He is not here; For he is risen, as he said come, see the place where the lord lay.
He is risen he is not there so the lords described was not there on the beginning of Sunday at the end of the sabbath. As it began to dawn toward the first day of the week, at the end of the sabbath the beginning of the first day of the week the lord jesus christ was not there. So it will allow three days and three nights if the lord jesus christ died on Wednesday afternoon at three o' clock and was buried by Joseph fabarimati before sunset because that day he was buried in preparation for the sabbath at sunset it will be the sabbath they cannot bury him. They wrapped him in a cloth and buried him before sunset so he was at care of the tomb exactly the beginning of Thursday and that will allow three days when he resurrected before the dawn of the first day. There were two sabbaths that year because the preparation, which is Wednesday and Thursday is a sabbath because there are different kinds of sabbath among the jews. Not all sabbaths falls on Saturday, there are sabbaths that can fall on any day of the week.