Lord of Time

Harry is the Master of Death and Lord of Time through his joining of the three Hallows together. During a duel that wasn't going well, he jumps to the 1940's and has a talk with the true Master of Death. Can have prevent the destruction that will occur? Can he change Voldemort prevent him from becoming the darkest wizard of all time? Or will he be caught in Tom's web? Slash TMR/HP?