'Year of' in the Bible

Now in the fifteenth year of [Emperor] Tiberius Caesar’s reign—when Pontius Pilate was governor of Judea, and Herod [Antipas] was tetrarch of Galilee, and his brother Philip was tetrarch of the region of Ituraea and Trachonitis, and Lysanias was tetrarch of Abilene—

to proclaim the favorable year of the Lord [the day when salvation and the favor of God abound greatly].”