'One year' in the Bible

Ahaziah [was] twenty-two years old when he became king, and he reigned one year in Jerusalem. The name of his mother [was] Athaliah daughter of Omri, king of Israel.

Josiah was eight years old when he became king, and reigned for thirty-one years in Jerusalem. His mother’s name was Jedidah daughter of Adaiah of Bozkath.