Q: WHAT YEAR DID ELAH'S REIGN END 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 873 BC.
On the Hebrew calendar, sometimes called the biblical calendar, the year was 3174 AM.
1 Kings 16:8 New King James Version (NKJV)
8 In the twenty-sixth year of Asa king of Judah, Elah the son of Baasha became king over Israel, and reigned two years in Tirzah.
1 Kings 16:10 New King James Version (NKJV)
10 And Zimri went in and struck him and killed him in the twenty-seventh year of Asa king of Judah, and reigned in his place.
1 Kings 16:15 New King James Version (NKJV)
15 In the twenty-seventh year of Asa king of Judah, Zimri had reigned in Tirzah seven days. And the people were encamped against Gibbethon, which belonged to the Philistines.