Judge Reggie Walton issued the order on Thursday, a month before the highly-anticipated trial of the former baseball star. Walton's chambers said previous commitments came off his calendar on April 16, allowing him to get the trial started earlier.
Last year's case ended in a mistrial after prosecutors showed jurors inadmissible evidence. Clemens, one of the game's most successful all-time pitchers, is accused of lying under oath when he testified before Congress in February 2008 that he never used performance-enhancing drugs in his career. Prosecutors will try to prove he used steroids and human growth hormone. Clemens says the evidence was manufactured by his former trainer.