2 Kings 13:10 - Clarke's commentary and critical notes on the Bible

In the thirty and seventh year of Joash king of Judah began Jehoash the son of Jehoahaz to reign over Israel in Samaria, and reigned sixteen years. In the thirty and seventh year - Joash, the son of Jehoahaz, was associated with his father in the government two years before his death. It is this association that is spoken of here. He succeeded him two years after, a little before the death of Elisha. Joash reigned sixteen years, which include the years he governed conjointly with his father. - Calmet.