Chronology
There has been considerable academic debate about the actual dates of reigns of the Israelite kings. Scholars have endeavored to synchronize the chronology of events referred to in the Bible with those derived from other external sources. The convention is to try to reduce the dating in terms of the current era dating, the Gregorian calendar. The sources create certain obstacles in their endeavours and has generated academic disagreements, as reflected in the table above.
Biblical scholars have noted the apparent inconsistencies in the chronology of the kings of Judah and Israel based on the biblical sources. Some have also pointed out the difficulties of cross-synchronising that dating with those of the other cultures of the area. Some have attempted to give as much historical weight as possible to the biblical sources, while others discount their reliability as a historic source, some even denying to the biblical sources any historical value at all.
Using the information in Kings and Chronicles, Edwin Thiele has calculated the dates of the reigns of the kings of Judah from the division of the kingdom, which he calculates to have been in 931-930 BC. Thiele noticed that for the first seven kings of Israel (ignoring Zimri's inconsequential seven-day reign), the synchronisms to Judean kings fell progressively behind by one year for each king. Thiele saw this as evidence that the northern kingdom was measuring the years by a non-accession system (first partial year of reign was counted as year one), whereas the southern kingdom was using the accession method (it was counted as year zero). Also he concluded that the calendars for reckoning the years of kings in Judah and Israel were offset by six months, that of Judah starting in Tishri (in the fall) and that of Israel in Nisan (in the spring). This is the conclusion from cross-synchronizations between the two kingdoms which often allows the narrowing of the beginning and/or ending dates of a king to within a six-month range, indicating the difference being due to the calendar starting date. Once these were understood, the various reign lengths and cross-synchronisms for these kings was worked out, and the sum of reigns for both kingdoms produced 931/930 BC for the division of the kingdom when working backwards from the Battle of Qarqar in 853 BC.
Thiele showed that for the reign of Jehoram, Judah adopted Israel's non-accession method of counting the years of reign, meaning that the first partial year of the king's reign was counted as his first full year, in contrast to the "accession" method previously in use whereby the first partial year was counted as year "zero," and "year one" was assigned to the first full year of reign. Thiele attributed this change to the rapprochement between Judah and Israel, whereby Jehoshaphat, Jehoram's father, made common cause with Ahab at the battle of Ramoth-Gilead, and chose a daughter for his son from the house of Ahab (1 Kings 22:1-38, 2 Kings 8:18). This convention was followed in Judah for the next three monarchs: Ahaziah, Athaliah, and Jehoash, returning to Judah's original accession reckoning in the time of Amaziah. These changes can be inferred from a careful comparison of the textual data in the Scripture, but because the Scriptural texts do not state explicitly whether the reckoning was by accession or non-accession counting, nor do they indicate explicitly when a change was made in the method, many have criticized Thiele's chronology as being entirely arbitrary in its assignment of accession and non-accession reckoning. The arbitrariness, however, apparently rested with the ancient kings and their court recorders, not with Thiele. The official records of Tiglath-Pileser III show that he switched (arbitrarily) to non-accession reckoning for his reign, in contrast with the accession method used for previous kings of Assyria. Tiglath-Pileser left no record explaining to modern historians which kind of method he was using, nor that he was switching from the method used by his predecessors; all of this is determined by a careful comparison of the relevant texts by Assyriologists, the same as Thiele did for the regnal data of Judah and Israel.
Read more about this topic: Kings Of Judah