The crucifixion occurred on the 14th of Nisan, which was the day of preparation for the Passover. It was ALWAYS "the day before the Sabbath", because the following day was first day of the Feast of Unleavened Bread, the "HIGH DAY" or special Sabbath.
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 19:31
Since the day had a fixed DATE (Nisan 15), the sabbath was a "holy convocation", and not necessarily a weekly or seventh-day sabbath. The Old Testament Passover always preceded the ANNUAL Sabbath called the first Day of Unleavened Bread.
And in the fourteenth day of the first month is the passover of the LORD. And in the fifteenth day of this month is the feast: seven days shall unleavened bread be eaten. In the first day shall be an holy convocation - Numbers 28:16-17
According to the Hebrew calendar, the Passover occurred on a Wednesday (Nisan 14) in the year of Christ's crucifixion. This means that the annual Sabbath had to be one day later—or Thursday (Nisan 15). This was the annual SABBATH that was approaching, thus requiring the swift burial of Jesus’ body. The weekly Sabbath, or Saturday, was to occur two days after that.
Christ died on the late afternoon (3pm Jewish time, or 9:00 pm Roman time) on Wednesday Passover (Nisan 14), and was resurrected three days later (72 hrs) on the late Saturday. Wednesday afternoon to Saturday afternoon is three days and three nights (72 hrs), meaning the resurrection of Jesus Christ did not occur on a Sunday, but on Saturday.
Sunday is often established as the day that Jesus Christ was resurrected because it would validate the traditions of man by “authorizing” the keeping of Sunday by the modern churches of the world. God’s true Sabbath has always been the 7th day (Saturday).
The Good Friday to Easter Sunday tradition collapses if Christ was in the grave for 72 hours (3 days and 3 nights). Also, Sunday-keeping collapses at the same time because the Sabbath can be traced all the way back to Genesis 2:2 and Exodus 20:8 was on the 7th day (Saturday).