It Happened Tomorrow (1944)

An ambitious newspaper reporter, eager to scoop the competition, wishes he could know the news before it happens. A mysterious old man grants the reporter that power, even as he cautions against using it. Now able to predict the news 24 hours in advance, the reporter goes about scooping all the other papers, picking sure-fire winners at the race track, and enjoying life... until he learns -- in advance, of course -- of his own death. Our hero's problem: How can he keep the future from happening?