“Evening had come.
It was the day
Before the Sabbath,”
Καὶ ἤδη ὀψίας γενομένης, ἐπεὶ ἦν Παρασκευή, ὅ ἐστιν προσάββατον
Matthew, chapter 27:57 simply mentioned that it was evening, without any mention of the Sabbath. Luke, chapter 23:54, and John, chapter 19:42 mentioned the same thing as Mark here that it was the day of preparation for the Sabbath. Mark said that evening had arrived (Καὶ ἤδη ὀψίας γενομένης), since it was the day of Preparation (ἐπεὶ ἦν Παρασκευή), which is the day before the Sabbath (ὅ ἐστιν προσάββατον). Everything would have to be done before sundown, which was the beginning of the Sabbath. Notice that it was evening, since no burials were permitted on the Sabbath or feast days.