The reign of Jehoshaphat

• Jehoshaphat (son of Asa and King of Judah)

• Start — 2 Kings 8:16. The year Jehoshaphat's regency began is the year his reign ended (3114) - the 25 years of his reign + the 1-year accession year duration undercount = 3090
• End — 1 Kings 22:42. The year Jehoshaphat's reign ended is the year his reign began (3090) + the length of his reign (25) - a 1-year duration overcount = = 3114

Shulman, p121

Years are anno hominis — counted from Creation as year 1 — which is the frame the source computes in. The arithmetic behind each boundary is given above rather than assumed.