Charles Ellicott Commentary Nehemiah 2:1

"And it came to pass in the month Nisan, in the twentieth year of Artaxerxes the king, when wine was before him, that I took up the wine, and gave it unto the king. Now I had not been [beforetime] sad in his presence." — Nehemiah 2:1 (ASV)

Nisan. —The old Abib, the first month of the Jewish year, following the vernal equinox. As we are still in the twentieth year of the king, the beginning of his reign must be dated before Chisleu. The record adopts Persian dates, and the two months fell in one year.