The feast of unleavened bread is never called a Sabbath in the Bible.
Exodus 12:15-16
15 Seven days shall ye eat unleavened bread; howbeit the first day ye shall put away leaven out of your houses; for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.
16 And in the first day there shall be to you a holy convocation, and in the seventh day a holy convocation; no manner of work shall be done in them, save that which every man must eat, that only may be done by you.
No work may be done on the Sabbath, the preparation and cooking of food is specifically permitted on the 1st and last day of Unleavened bread.
All four gospels agree that Jesus was crucified on "parasceue" which means "preparation." In the time of Jesus and today the Greek word "parasceue" was and is the name of the day we call Friday.
There was one day of preparation in passion week "Friday" the day before the Sabbath. Jesus was found to be risen early "Sunday" morning.
Exodus 12:3-14
3 Speak ye unto all the congregation of Israel, saying, In the tenth day of this month they shall take to them every man a lamb, according to the house of their fathers, a lamb for an house:
4 And if the household be too little for the lamb, let him and his neighbour next unto his house take it according to the number of the souls; every man according to his eating shall make your count for the lamb.
5 Your lamb shall be without blemish, a male of the first year: ye shall take it out from the sheep, or from the goats:
6 And ye shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening.
7 And they shall take of the blood, and strike it on the two side posts and on the upper door post of the houses, wherein they shall eat it.
8 And they shall eat the flesh in that night, roast with fire, and unleavened bread; and with bitter herbs they shall eat it.
9 Eat not of it raw, nor sodden at all with water, but roast with fire; his head with his legs, and with the purtenance thereof.
10 And ye shall let nothing of it remain until the morning; and that which remaineth of it until the morning ye shall burn with fire.
11 And thus shall ye eat it; with your loins girded, your shoes on your feet, and your staff in your hand; and ye shall eat it in haste: it is the Lord's passover.
12 For I will pass through the land of Egypt this night, and will smite all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment: I am the Lord.
13 And the blood shall be to you for a token upon the houses where ye are: and when I see the blood, I will pass over you, and the plague shall not be upon you to destroy you, when I smite the land of Egypt.
14 And this day shall be unto you for a memorial; and ye shall keep it a feast to the Lord throughout your generations; ye shall keep it a feast by an ordinance for ever.
The Passover was the evening of the 15th day. That year, the 14th was on Wednesday, and the 15th was on Thursday. Luke 23:54
54 And that day was the preparation, and the sabbath drew on.
That was preparation for the Passover. Luke 22:1
1 Now the feast of unleavened bread drew nigh, which is called the Passover.
The Passover was the day of the month, not changed to fall on Friday every year.
There was the high Sabbath, the Passover. It was the most important day of the year to them.
John 19:31
31 The Jews therefore, because it was the preparation, that the bodies should not remain upon the cross on the sabbath day, (for that sabbath day was an high day,) besought Pilate that their legs might be broken, and that they might be taken away.
John called the Passover a Sabbath and an high day. That is the Passover on Thursday. Pilate, the judgment, was being carried out during the preparation of the Passover. On Friday, after the Passover, is when they demanded Pilate seal the tomb, lest in the next few days, the disciples steal the body. They were not too worried on Wednesday during the crucifixion and Thursday of the Passover. It was on Friday, they wanted the tomb sealed.