'Year' in the Bible

The words of Nehemiah son of Hacaliah:Now it happened in the month of Chislev, in the twentieth year [of the Persian king], as I was in the capitol of Susa,

In the month of Nisan, in the twentieth year of King Artaxerxes, when wine was placed before him, I took the wine and gave it to the king. Now I had not [previously] been sad in his presence.

Moreover, from the day that I was appointed to be their governor in the land of Judah, from the twentieth year to the thirty-second year of King Artaxerxes, for twelve years, neither I nor my relatives have eaten the governor’s food allowance.

As for the peoples of the land who bring merchandise or any grain on the Sabbath day to sell, we will not buy from them on the Sabbath or on a holy day; and we will give up raising crops during the seventh year [leaving the land uncultivated], and forgive every debt.

We have also cast lots—the priests, the Levites, and the people—for [contributing] the supply of wood, to bring it to the house of our God, according to our fathers’ households, at set times annually, to burn on the altar of the Lord our God, as it is written in the Law;

and [we obligate ourselves] to bring the first fruits of our ground and the first fruits of all the fruit of every tree to the house of the Lord annually,

But during all this time I was not at Jerusalem, for in the thirty-second year of Artaxerxes [Persian] king of Babylon I went to the king. Then after some time I asked for a leave [of absence] from the king,