'Month' in the Bible

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

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

And it came about in the fourth year of King Darius, that the word of the Lord came to Zechariah on the fourth day of the ninth month, the month Chislev.

And to say to the priests of the house of the Lord of armies and to the prophets, Am I to go on weeping in the fifth month, separating myself as I have done in past years?

This is what the Lord of armies has said: The times of going without food in the fourth month and in the fifth and the seventh and the tenth months, will be for the people of Judah times of joy and happy meetings; so be lovers of good faith and of peace.

And in one month I put an end to the three keepers of the flock; for my soul was tired of them, and their souls were disgusted with me.