‘The word which came to Jeremiah concerning all the people of Judah, in the fourth year of Jehoiakim the son of Josiah, king of Judah (the same was the first year of Nebuchadrezzar king of Babylon,)'
This is the first oracle to be so accurately dated, and it indicates that the oracle came to Jeremiah in the fourth year of Jehoiakim which was the first year of Nebuchadrezzar. Thus it was around 604 BC. Egypt were now licking their wounds after Carchemish and Hamath, and Jehoakim would have had to submit to Nebuchadrezzar and would be paying tribute. It was no doubt in the light of this that Jeremiah came to the feast and spoke these words.
Daniel dates it in the third year of Jehoiakim but that was because he was excluding the accession year according to Babylonian practise (the ‘first year' always being the second year because the accession year was only a partial year.). Jeremiah was including the accession year.