Jeremiah 1:3

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 Jeremiah 25:1, no mention is made of Jehoahaz, who reigned between Josiah and Jehoiakim, because his reign was short, but three months, 2 Kings 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, 2 Kings 22:11, three months under Jehoahaz, 2 Kings 23:31 eleven years under Jehoiakim, 2 Kings 23:36, three months under Jeconiah, 2 Kings 24:8, and eleven years under Zedekiah, when the city was besieged and taken, 2 Kings 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, 2 Kings 25:8 the ninth of the said month is now kept by the Jews as a fast on that account.