'Month' in the Bible

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

Upon the four and twentieth day of the eleventh month, which is the month Shebat, in the second year of Darius, came the word of Jehovah unto Zechariah the prophet, the son of Berechiah, the son of Iddo, saying,

And it came to pass in the fourth year of king Darius, that the word of Jehovah came unto Zechariah on the fourth day of the ninth month, even in Chislev,

and to speak unto the priests that were in the house of Jehovah of hosts, and to the prophets, saying, Should I weep in the fifth month, separating myself, as I have done now so many years?

Speak unto all the people of the land, and to the priests, saying, When ye fasted and mourned in the fifth and in the seventh month, even those seventy years, did ye really fast unto me, even unto me?

Thus saith Jehovah of hosts: The fast of the fourth month and the fast of the fifth, and the fast of the seventh, and the fast of the tenth, shall be to the house of Judah joy and gladness, and cheerful gatherings. Love ye then truth and peace.

And I destroyed three shepherds in one month; and my soul was vexed with them, and their soul also loathed me.