John Gill

And it came also in the days of Jehoiakim, the son of Josiah king of Judah,.... In the beginning of his reign, and in the fourth year of his reign; see Jer 25:1, no mention is made of Jehoahaz, who reigned between Josiah and Jehoiakim, because his reign was short, but three months, Kg2 23:31, and perhaps no word of the Lord came to Jeremiah in his time, though it did before and after: unto the end of the eleventh year of Zedekiah the son of Josiah king of Judah; so that Jeremiah must prophesy in the land of Judea upwards of forty years; eighteen under Josiah, Kg2 22:11, three months under Jehoahaz, Kg2 23:31 eleven years under Jehoiakim, Kg2 23:36, three months under Jeconiah, Kg2 24:8, and eleven years under Zedekiah, when the city was besieged and taken, Kg2 25:2. Josiah had three sons as kings of Judah, Jehoahaz, Jehoiakim, and Zedekiah, under all whom Jeremiah prophesied: even unto the carrying away of Jerusalem captive in the fifth month: the month Ab, which answers to part of July and part of August; and it was on the ninth or tenth day of this month that the city of Jerusalem was burnt, and the people carried captive, Kg2 25:8 the ninth of the said month is now kept by the Jews as a fast on that account.