'Year of' in the Bible

And it happened in the month Nisan, in the twentieth year of Artaxerxes the king, wine was before him. And I took up the wine and gave it to the king. Now I had not been sad in his presence before.

And from the time that I was chosen to be their governor in the land of Judah, from the twentieth year even to the thirty-second year of Artaxerxes the king, twelve years, I and my brothers have not eaten the bread of the governor.

But in all this time I was not at Jerusalem. For in the thirty-second year of Artaxerxes king of Babylon, I came to the king. And after some days I was given permission to leave the king.