'Week' in the Bible

and when he saw that it pleased the Jews, he proceeded to have Peter arrested as well. This was during the days of Unleavened Bread [the Passover week].

We sailed from Philippi after the days of Unleavened Bread (Passover week), and within five days we reached them at Troas, where we stayed for seven days.

Now on the first day of the week (Sunday), when we were gathered together to break bread (share communion), Paul began talking with them, intending to leave the next day; and he kept on with his message until midnight.