Baasha Begins 24 Year Reign (Israel) — 3rd Year Asa (Judah)—I Kings 15:33

Q: WHAT YEAR DID BAASHA BEGIN HIS REIGN IN ISRAEL?
A: IT DEPENDS WHAT CALENDAR YOU ARE USING!
On the Gregorian calendar (the one you might have on your wall) the year was 897 BC.
On the Hebrew calendar, sometimes called the biblical calendar, the year was 3150 AM.
RELATED VERSES
I Kings 15:33 – In the third year of Asa king of Judah began Baasha the son of Ahijah to reign over all Israel in Tirzah, twenty and four years. 
1 Kings 14:20 New King James Version (NKJV)
20 The period that Jeroboam reigned was twenty-two years. So he rested with his fathers. Then Nadab his son reigned in his place.
1 Kings 15:25 New King James Version (NKJV)
Nadab Reigns in Israel
25 Now Nadab the son of Jeroboam became king over Israel in the second year of Asa king of Judah, and he reigned over Israel two years.