What does 2 Chronicles 34:1 mean?

2 Chronicles 34:1 KJV
Josiah [was] eight years old when he began to reign, and he reigned in Jerusalem one and thirty years.

2 Chronicles 34:1 MKJV
Josiah [was] eight years old when he began to reign, and he reigned in Jerusalem thirty-one years.

2 Chronicles 34:1 NKJV
Josiah [was] eight years old when he became king, and he reigned thirty-one years in Jerusalem.

2 Chronicles 34:1 KJV 2000
Josiah was eight years old when he began to reign, and he reigned in Jerusalem one and thirty years.

Interlinear KJV

Josiah /Yo’shiyah/ was eight /sh@moneh/ years /shaneh (in pl. only),/ old /ben/ when he began to reign, /malak/ and he reigned /malak/ in Jerusalem /Y@ruwshalaim/ one /’echad/ and thirty /sh@lowshiym/ years. /shaneh (in pl. only),/

Matthew Poole’s Commentary

Josiah’s good reign, 2Ch 34:1,2. He destroyeth idolatry, 2Ch 34:3-7. He repairs the temple, 2Ch 34:8-13. The book of the law found, 2Ch 34:14-22. Huldah prophesieth the destruction of Jerusalem, 2Ch 34:23-28. Josiah’s covenant with God, 2Ch 34:29-33.

Ver. 1. Of this chapter, see the notes on 2Ki 22:1-20; 23:1-37.