FACT: The Sabbath was approaching. However, Friday evening is not the only day that is a Sabbath. There are Sabbaths that occur during the high days or Festivals and can occur on any day of the week. It was not the normal Friday evening Sabbath that was approaching but the high Sabbath of the Festival of Unleavened Bread. There were 2 Sabbaths that week.
(Joh 19:31) 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. NASB