'Year' 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 it shall come to pass, that all that are left of all the nations which came against Jerusalem shall go up from year to year to worship the King, Jehovah of hosts, and to celebrate the feast of tabernacles.