2 Kings 22:3

And it came to pass in the eighteenth year of King Josiah,.... Not of his age, but of his reign, as appears from Ch2 34:8 nor is what follows the first remarkable act he did in a religious way; for…

In the eighteenth year - This is the date of the finding of the Book of the Law and of the Passover (marginal reference, and 2Ki 23:23), but is not meant to apply to all the various reforms of Josiah…

Concerning Josiah we are here told,

I. That he was very young when he began to reign (Kg2 22:1), only eight years old. Solomon says, Woe unto thee, O land! when thy king is a child; but happy art…

And it came to pass in the eighteenth year The Chronicler gives two dates anterior to this for events in the course of Josiah's life. He says (2Ch 34:3-7 R.V.) -In the eighth year of his reign while…