When a sabbath arrives, one can commence to say "Shabbat shalom" at sunset and continue with that sentiment until sunset the next day. A high sabbath is distinct from the seventh day sabbath in that it does not need to fall on the seventh day of the week as the event makes the day a sabbath rather than the day qualifying the event as a sabbath. These verses show a high sabbath preparation for Passover, when the lamb is slain for the Passover meal and prepared for the meal that evening when the (high Sabbath of) Passover arrives. In the exodus this is the time the Israelites placed the blood on the doorposts:
John 19:14 It was the day of Preparation for the Passover, about the sixth hour. And Pilate said to the Jews, “Here is your King!”
John 19:31 It was the day of Preparation, and the next day was a High Sabbath. In order that the bodies would not remain on the cross during the Sabbath, the Jews asked Pilate to have the legs broken and the bodies removed.
John 19:42 And because it was the Jewish day of Preparation and the tomb was nearby, they placed Jesus there.
Then Matthew, Mark, Luke, and John speak of the first day of the week, which is clearly after the seventh day weekly sabbath, "very early in the morning of an "evening and the morning" day which would conclude that Sunday evening.
Jesus said in Matthew 12:40, "For as Jonah was three days and three nights in the belly of the great fish, so the Son of Man will be three days and three nights in the heart of the earth," so we conclude our count on a night: Saturday, Friday, Thursday night...then fill in the days, Saturday, Friday, Thursday day.... and so we Have Thursday morning (day of preparation of Passover and Jesus crucified and buried), Thursday night (high Sabbath of Passover arrives), Friday morning (normally day of preparation for weekly sabbath because it is 6th day of the week but I'm not sure if there is any prep being that it is also Passover in this instance), Friday night (7th day Shabbat arrives), Saturday morning (7th day Shabbat), Saturday night (first day of the week arrives). Sunday morning , at dawn, Jesus is definitely no longer in the belly of the earth.