Melachim Bais 23:23

23 But in the eighteenth year of Melech Yoshiyah, wherein this Pesach was kept to Hashem in Yerushalayim.

Melachim Bais 23:23 Meaning and Commentary

2 Kings 23:23

But in the eighteenth year of king Josiah, wherein this
passover was holden to the Lord in Jerusalem.
] This shows that Josiah must begin the reformation very early that year, since he did all that is before recorded in this and the preceding chapter by the fourteenth of Nisan, the day on which the passover was kept, which month answers to part of our March and part of April, see ( 2 Kings 22:3 ) and was the same year the repairs of the temple were finished.

Melachim Bais 23:23 In-Context

21 And HaMelech commanded kol HaAm, saying, Make Pesach unto Hashem Eloheichem, as it is written in the Sefer HaBrit HaZeh.

22 Surely there was not kept such a Pesach from the days of the Shofetim that judged Yisroel, nor in all the days of the Melachim of Yisroel, nor of the Melachim of Yehudah;

23 But in the eighteenth year of Melech Yoshiyah, wherein this Pesach was kept to Hashem in Yerushalayim.

24 Moreover the mediums with familiar spirits, and the yidonim (spiritists), and the terafim, and the gillulim (idols), and all the shikkutzim that were seen in Eretz Yehudah and in Yerushalayim, did Yoshiyah put away, that he might confirm the Divrei HaTorah which were written in the Sefer that Chilkiyah HaKohen found in the Beis Hashem.

25 And like him was there no Melech before him, that turned to Hashem with all his lev, and with all his nefesh, and with all his me’od (strength), according to all the Torat Moshe; neither after him arose there any like him.