'Week' in the Bible

Now on the first day of the week Mary Magdalene came to the tomb early, while it was still dark, and saw the stone [already] removed from the [groove across the entrance of the] tomb.

So when it was evening on that same day, the first day of the week, though the disciples were [meeting] behind barred doors for fear of the Jews, Jesus came and stood among them, and said, “Peace to you.”