'Month' in the Bible

In the eighth month, in the second year of Darius, the word of Yahweh came to Zechariah the son of Berechiah, the son of Iddo, the prophet, saying,

On the twenty-fourth day of the eleventh month, which is the month Shebat, in the second year of Darius, the word of Yahweh came to Zechariah the son of Berechiah, the son of Iddo, the prophet, saying,

It happened in the fourth year of king Darius that the word of Yahweh came to Zechariah in the fourth day of the ninth month, the month of Chislev.

and to speak to the priests of the house of Yahweh of Armies, and to the prophets, saying, "Should I weep in the fifth month, separating myself, as I have done these so many years?"

"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?

I cut off the three shepherds in one month; for my soul was weary of them, and their soul also loathed me.