'Seventh' in the Bible

"Speak to all the people of the land, and to the priests, saying, 'When you fasted and mourned in the fifth and in the seventh month for these seventy years, did you at all fast to me, really to me?

Thus says Yahweh of Armies: "The fasts of the fourth fifth, seventh, and tenth months shall be for the house of Judah joy and gladness, and cheerful feasts. Therefore love truth and peace."