Frozen In Time by Katsuya Masuda
A magician shows a picture of a pocketwatch which is sealed inside a lucite block. The lucite block is kept in a transparent plastic cover. A black spot on the plastic cover hides the watch face so that no can see when the watch was photographed. The magician asks a spectator to name any hour. (This is not the magician's choice or a force.) Then the lucite block is removed from the cover revealing that the watch diplays the same hour as the spectator's choice.
Frozen in Time allows you to predict a randomly selected time with nothing more complicated than a photograph. No electronics, no complicated gimmicks.