Preparation day for the annual, not weekly, Sabbath.
In the morning, Jesus was brought before Pilate the governor.
Jesus was crucified and dies around 3PM
Jesus' body was placed in the tomb at twilight....
Annual Sabbath begins at sunset. Sunset at this time of year in Jerusalem, is about 6:30 to 7:00 PM
Luke 23.44 shows that Jesus died around the ninth hour or approximately 3PM. He would have been buried before sunset because of the approaching Sabbath, for that Sabbath day was a high-day (John 19.31).
John 19.31 mentions that the day following Jesus' crucifixion was a high day as opposed to the weekly seventh-day Sabbath. TWO Sabbaths – first an annual Holy Day and then the regular weekly Sabbath – are mentioned in the Gospel accounts. Compare Mark 16.1 with Luke 23.56