Hill Valley High School was an educational institution in Hill Valley. It was built during the later years of the Great Depression and lasted in the original timeline at least up to 1985. On November 7, 1955, while Marty McFly and Emmett Brown were waiting in one of the school halls for George's class to end, Doc noticed that the clock there was ten seconds slow, muttering "You'd think a public school would at least have the correct time."