Here is a helpful post which shows the accuracy of the Biblical Account. I learned these facts while still in bible college but want to repost them here for the benefit of non-technical readers. I am a Bible believer who holds it as God’s word to humanity. This is why I resist most modern attempts from linear Greco-Roman thinking to date the writings other than what the bible witnesses. Look also for a forthcoming post on the unity of the book of Isaiah.
The official start of the new year was different in Judah (Tishri) than in Israel (Nisan). Judah initially used accession year reckoning whereas Israel used non-accession year reckoning. For a while Judah switched to non-accession year reckoning before switching back to accession year reckoning. Israel eventually changed to accession year reckoning. For Judah, there was the matter of coregencies.By recognizing that Uzziah’s reign was reckoned according to Judah’s Tishri-based year while the northern kingdom observed a Niasan-based year for its kings, what otherwise seem to be occasional discordancies in the synchronisms all fall into place. This six-month difference in when the year began then provided to be a useful aid in determining the half-year in which some of these kings terminated their reign, and in the the cases of Jeroboam II through Shallum, the actual month of the kings’ death could be determined…The basic data that allows this kind of precision in dating could never have been provided by a late-date editor; the data must have come from contemporary accounts, probably from the official court records of these two kingdoms. A. Steinmann, From Abraham to Paul: A Biblical Chronology (Concordia 2011), 128, 139-40; cf. 38-39.