'Of The Month' in the Bible

And it came to pass, on the morrow, the second of the month, that David's place was empty, - and Saul said unto Jonathan his son, Wherefore hath not the son of Jesse come in, either yesterday or to-day, to meat?

Jonathan therefore rose up from the table, in a glow of anger, - and did eat no food on the second day of the month, for he was grieved for David, because his father had reviled him.