'Year' in the Bible

As for the Hebronites: Jeriah was the leader of the Hebronites according to the genealogical records. In the fortieth year of David's reign, they examined the records and discovered there were highly respected men in Jazer in Gilead.

What follows is a list of Israelite family leaders and commanders of units of a thousand and a hundred, as well as their officers who served the king in various matters. Each division was assigned to serve for one month during the year; each consisted of 24,000 men.