One question of considerable importance is how can events in the Biblical Calendar be tied to our modern day secular or Gregorian calendar with certainty. The end of king Solomon's reign upon his death and the subsequent division of the kingdom of Israel into northern and southern tribes is a common calendar link point used by historians and biblical scholars. But historians and scholars disagree slightly on the exact year for this event, some support 931BC while others support 930BC. So there would appear to be some uncertainty as to which date is correct. In order to address this important question, the first step to be taken is to determine relative time spans between events in the biblical calendar using only the Bible. Once this is done, one can begin to look at secular data and dates, and determine whether the time spans between secular dates agree with the biblical data. If agreement can be found at several points between the biblical and secular calendars, then one can confidently position the biblical calendar with respect to the secular calendar. In his book, "The Harmony of the Hebrew Kings", this is exactly what Mr Camping presents in chapter 2 (read online: The Harmony of the Hebrew Kings - Chapter 2). In this book there are 3 historical "fixes" presented which allow the biblical calendar to be synchronized to the secular calendar:
Fix #1 -- this fix relates to the reigns of Jehu and Ahab and notes how the 12 year time span between the end of Ahab's reign and the start of Jehu's reign fits exactly with ancient records and the Assyrian eponym list, which list can be firmly dated in secular history by a solar eclipse in Babylon (in 763BC). This permits Ahab's reign to be dated, and from there one can work backwards in the biblical record to determine that the end of Solomon's reign was in 931BC (see pages 68-69 of above book).
Fix #2 -- the number of years in the biblical calendar from the end of Solomon's reign until the fall of Samaria is 222. Secular records for Sargon II indicate that in his 13th year as king of Assyria he also became king of Babylon, and in that year he conquered Samaria, which the Assyrian eponym list indicates to be 709BC. Working backwards the 222 years of the biblical calendar puts the end of Solomon's reign in 931BC, the same result as found in Fix #1 (see pages 69-73 of above book).
Fix #3 -- the number of years in the biblical calendar from the end of Solomon's reign until the 14th year of Hezekiah is 230. Secular records for Sennacherib indicate he came against Jerusalem in the year 701BC, and working back the 230 years of the biblical calendar again puts the end of Solomon's reign in 931BC, just as Fix #1 and #2 do (see pages 73-75).
From this we can see that the biblical fixes to the secular record are the last year of Ahab's reign, the first year of Jehu's reign, the year Samaria was conquered by Babylon, and the 14th year of Hezekiah. It is these four points in the biblical calendar which fit exactly to the secular data so that we can establish 931 BC as the last year of Solomon's reign and 709 BC as the fall of Samaria (northern kingdom). In addition, the biblical calendar indicates there are 344 years from the end of Solomon's reign until the fall of Jerusalem, which would put the fall of Jerusalem in 587 BC.
In this same book Mr Camping mentions another important confirmation of 587 BC for the fall of Jerusalem based on secular dating of Nebuchadnezzar's reign and the biblical citations in Jeremiah 32:1 and 52:29 which show that Jerusalem was conquered and carried away to Babylon in Nebuchadnezzar's 18th year, which was 587BC, the same result as found above (see pages 75-76).
A final note, Mr Camping also alludes to other possible calendar fixes from Egyptian records (see page 80, where he refers to his book "Adam When" pages 106-159), however I've found Egyptian records are not of the same caliber as Assyrian and Babylonian records, and that the Bible doesn't give precise information with respect to Egyptian kings (Pharaoh's) like it does for Babylonian and Assyrian kings (i.e, the Bible dates several key events in the time line to the exact regnal year of Assyrian and Babylonian kings, but never to an Egyptian king, suggesting to me that we are to align the biblical and secular calendars using Assyrian and Babylonian kings and records rather than Egyptian kings and records).