'Year' in the Bible

The words of Nehemiah son of Hacaliah. It happened in the month of Kislev, in the twentieth year, that I myself was in the citadel in Susa,

It happened in the month of Nisan, in the twentieth year of King Artaxerxes, when wine was before him, I carried the wine and gave it to the king. And I had never been sad before the king.

Moreover, from the appointed day I was made their governor in the land of Judah, from the twentieth year until the thirty-second year of King Artaxerxes--twelve years. My brothers and I did not eat the food [allowance] of the governor.

And the peoples of the land who bring merchandise and any grain on the Sabbath day to sell, we will not accept it from them on the Sabbath or on a holy day. We will forego [the crops of] the seventh year and [cancel] every debt.

And we have cast lots for the contributions of the wood offering of the priests, the Levites, and the people to bring [it] to the house of our God, by our fathers' houses, at designated times, year by year, to burn on the altar of Yahweh our God--as it is written in the law.

We [also] bring the first fruits of our soil and the first fruits of all the fruit trees, year by year, for the house of Yahweh.

During all of this, I was not in Jerusalem because in the thirty-second year of Artaxerxes king of Babylon I went to the king. At the end of [some] days I asked permission from the king [to leave].