'Thirty' in the Bible

In the thirty-seventh year of Judah’s King Joash, Jehoash son of Jehoahaz became king over Israel in Samaria and reigned 16 years.

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

In the thirty-ninth year of Judah’s King Uzziah, Shallum son of Jabesh became king; he reigned in Samaria a full month.

In the thirty-ninth year of Judah’s King Azariah, Menahem son of Gadi became king over Israel and reigned 10 years in Samaria.

On the twenty-seventh day of the twelfth month of the thirty-seventh year of the exile of Judah’s King Jehoiachin, in the year Evil-merodach became king of Babylon, he pardoned King Jehoiachin of Judah and released him from prison.