'Year' 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.

It will happen that everyone who is left of all the nations that came against Jerusalem will go up from year to year to worship the King, Yahweh of Armies, and to keep the feast of tents.