At the end of the days, i.e., the three years specified in Daniel 1:5. Before the conclusion of this time, it appears (Daniel 2:1), Daniel was enabled to give a proof of his wisdom. (See Daniel 2:28.)
Related Commentaries of Daniel 1:18
Daniel 1:18
18 Now at the end of the days that the king had said he should bring them in, then the prince of the eunuchs brought them in before Nebuchadnezzar.