'Year' in the Bible

In the eighth month, in the second year of Darius, the word of the Lord came to the prophet Zechariah son of Berechiah, son of Iddo:

The Night VisionsOn the twenty-fourth day of the eleventh month, which is the month of Shebat, in the second year of Darius, the word of the Lord came to the prophet Zechariah son of Berechiah, son of Iddo:

In the fourth year of King Darius, the word of the Lord came to Zechariah on the fourth day of the ninth month, which is Chislev.

Then all the survivors from the nations that came against Jerusalem will go up year after year to worship the King, the Lord of Hosts, and to celebrate the Festival of Booths.