The reign of Hezekiah

• Hezekiah (King of Judah, son of Ahaz)

• Start — 2 Kings 18:1. The year Hezekiah's co-regency began is the year Hoshea's reign began (3231) + 3 years - a 1-year duration overcount = 3233
• End — 2 Kings 18:2. The year Hezekiah's reign ended is the year his reign began (3246) + the length of his reign (29) = 3275

Shulman, p125

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.