Adam Clarke on 2 Chronicles 15:19

The five and thirtieth year of the reign of Asa - Archbishop Usher thinks that this should be counted from the separation of the kingdom, and that this fell on the fifteenth year of Asa's reign. To settle in every respect these chronologies is a most difficult undertaking; and the difficulty does not belong to the sacred books alone, all other chronological tables of all the nations in the world, are in the same predicament. With those of our own history I have often been puzzled, even while I had access to all the archives of the nation. Probably we should read here the five and twentieth year. See the note on 1Kgs 15:16.