'Year' in the Bible

In the eighth month, in the second year of Darius, hath a word of Jehovah been unto Zechariah, son of Berechiah, son of Iddo, the prophet, saying:

On the twenty and fourth day of the eleventh month, (it is the month of Sebat,) in the second year of Darius, hath a word of Jehovah been unto Zechariah, son of Berechiah, son of Iddo, the prophet, saying:

And it cometh to pass, in the fourth year of Darius the king hath a word of Jehovah been unto Zechariah, in the fourth of the ninth month, in Chisleu.

And it hath come to pass, Every one who hath been left of all the nations, Who are coming in against Jerusalem, They have also gone up from year to year, To bow themselves to the King, Jehovah of Hosts, And to celebrate the feast of the booths.