Albert Barnes Commentary 2 Chronicles 15:19

"And there was no more war unto the five and thirtieth year of the reign of Asa." — 2 Chronicles 15:19 (ASV)

The five and thirtieth year of the reign of Asa - This cannot be reconciled with the chronology found in 1 Kings 16:8. Furthermore, the suggestion in the marginal note implies a method of marking time that is unknown to this author or any other biblical writer.

It is therefore supposed that the numbers here and in 2 Chronicles 16:1 are corrupt, and that in both verses, “twentieth” should replace “thirtieth.” The attack of Baasha would then have been made in the last year of Asa’s reign, and ten years of peace would have followed Asa’s victory over Zerah.