'Months' in the Bible

In the thirty-eighth year of Azariah king of Judah, Zechariah the son of Jeroboam became king over Israel in Samaria for six months.

Jehoahaz was twenty-three years old when he became king, and he reigned three months in Jerusalem; and his mother’s name was Hamutal the daughter of Jeremiah of Libnah.

Jehoiachin was eighteen years old when he became king, and he reigned three months in Jerusalem; and his mother’s name was Nehushta the daughter of Elnathan of Jerusalem.