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2 Kings 23:23
But in the eighteenth year of king Josiah, wherein this passover was holden to the Lord in Jerusalem. (2 Kings 23:23)
Eighteenth year.
 The repair of the Temple also began in this year (2 Kings 22:3-6). Since the Passover was held on the 14th day of Nisan, the first month of the religious year (Ex. 12:2, 6, 18; 2 Chron. 35:1), it is obvious that Josiah began his regnal year with Tishri rather than Nisan, thus allowing about 5 months for the Temple repairs to be made before the celebration of the Passover in the same year.