'Year of' in the Bible

Of the Hebronites was Jerijah the chief, even of the Hebronites, according to their generations by ancestral houses. In the fortieth year of the reign of David they were sought for, and there were found among them mighty men of valor at Jazer of Gilead.

Now the children of Israel after their number, the heads of ancestral houses and the captains of thousands and of hundreds, and their officers who served the king, in any matter of the divisions which came in and went out month by month throughout all the months of the year?of every division were twenty-four thousand.