'Month' in the Bible

In the eighth month of the second year [of the reign] of Darius [the king of Persia], the word of the Lord came to Zechariah (the Lord remembers) the son of Berechiah, the son of Iddo, the prophet, saying,

On the twenty-fourth day of the eleventh month (Feb 15, 519 b.c.), which is the month of Shebat, in the second year of [the reign of] Darius, the word of the Lord came to Zechariah the prophet, the son of Berechiah, the son of Iddo, as follows:

In the fourth year of [the reign of] King Darius [of Persia], the word of the Lord came to Zechariah on the fourth day of the ninth month, which is Chislev (Dec 7, 518 b.c.).

speaking to the priests who belong to the house of the Lord of hosts and to the prophets, saying, “[Now that I am returned from exile] shall I weep in the fifth month [mourning the destruction of the temple], and fast as I have done these many years [in Babylon]?”

“Thus says the Lord of hosts, ‘The fast of the fourth [month to mourn the breaching of Jerusalem’s walls], the fast of the fifth [month to mourn the temple’s destruction], the fast of the seventh [month to mourn Gedaliah’s assassination], and the fast of the tenth [month to mourn the siege of Jerusalem] will become times of joy and gladness and cheerful feasts for the house of Judah; so [to bring this about] love truth and peace.’

Then I eliminated the three [incompetent, unfit] shepherds [the civil rulers, the priests, and the prophets] in one month, for I was impatient with them, and they also were tired of me and despised me.