'Seventh Day' in the Bible

And the seventh day of the fifth month which was in the nineteenth year of king Nebuchadnezzar king of Babylon, came Nebuzaradan servant of the king of Babylon and chief Marshal, unto Jerusalem:

Notwithstanding yet the thirty seventh year after Jehoiachin king of Judah was carried away, the twenty seventh day of the twelfth month, did Evilmerodach king of Babylon lift up the head of Jehoiachin king of Judah out of the prison house,