'Month' in the Bible
Solomon had twelve deputies over all Israel, who secured provisions for the king and his household; each man had to provide for a month in the year.
Geber the son of Uri, in the land of Gilead, the country of Sihon king of the Amorites and of Og king of Bashan; and he was the only officer who was in the land.
Those deputies provided food for King Solomon and for all [the staff] who came to King Solomon’s table, each in his month; they let nothing be lacking.
He sent them to Lebanon, 10,000 a month in shifts; one month they were in Lebanon and two months at home. Adoniram was in charge of the forced laborers.
Now it came about in the four hundred and eightieth year after the Israelites came out of the land of Egypt, in the fourth year of Solomon’s reign over Israel, in the month of Ziv (April-May) which is the second month, that he began to build the Lord’s house (temple).
In the fourth year [of King Solomon’s reign] the foundation of the Lord’s house was laid, in the [second] month, Ziv (April-May).
In the eleventh year [of King Solomon’s reign] in the month of Bul (October-November), that is, the eighth month, the house was finished throughout all its parts and in accordance with all its specifications. So he built it in seven years.
All the men of Israel assembled before King Solomon at the feast in the month of Ethanim (September-October), that is, the seventh month.
Jeroboam held a feast on the fifteenth day of the eighth month, like the feast which is kept in Judah, and he went up to the altar; he did this in Bethel, sacrificing to the calves which he had made. And he stationed in Bethel the priests of the high places which he had made.
So he went up to the altar which he had made in Bethel on the fifteenth day of the eighth month, in the month which he had devised in his own heart [in defiance of God’s commandments]; and he held a feast for the Israelites and he went up to the altar to burn incense [in defiance of God’s law.]