'Seventh' in the Bible

So death came to Hananiah the prophet the same year, in the seventh month.

Now it came about in the seventh month that Ishmael, the son of Nethaniah, the son of Elishama, of the king's seed, having with him ten men, came to Gedaliah, the son of Ahikam, in Mizpah; and they had a meal together in Mizpah.

These are the people whom Nebuchadrezzar took away prisoner: in the seventh year, three thousand and twenty-three Jews:

And in the thirty-seventh year after Jehoiachin, king of Judah, had been taken prisoner, in the twelfth month, on the twenty-fifth day of the month, Evil-merodach, king of Babylon, in the first year after he became king, took Jehoiachin, king of Judah, out of prison.