'On that Day' in the Bible

So, when it was evening on that day, [which was] the first day of the week [i.e., Sunday] and the doors [of someone's house], where the disciples were gathered, were closed [i.e., probably locked] for fear of the Jewish authorities, Jesus came and stood among them. [Note: Probably Jesus passed through the closed door miraculously]. He said to them, "May there be peace in your hearts."