Oppenheimer ' s teaser trailer was released on July 28, 2022, featuring a live countdown to 5:29 a.m. (MDT) on July 16, 2023, the 78th anniversary of the first detonation of an atomic weapon ; it premiered in screenings of Nope before being posted online on Universal's social media profiles. Empire commented that it is exemplary of Nolan's style: "heady, brooding stuff with a real sense of weight".