The fourth year - See Daniel 1:1 note. This invasion of Judaea, in which Daniel was carried captive to Babylon, was according to the date of the years the fourth, but according to the actual time the third, year of the Jewish king. Nebuchadnezzar was not yet fully king, but associated with his father Nabopalassar.
Related Commentaries of Jeremiah 25:1
Jeremiah 25:1
1 The word that came to Jeremiah concerning all the people of Judah in the fourth year of Jehoiakim the son of Josiah king of Judah, that was the first year of Nebuchadrezzar king of Babylon;