Release date of the movie Back to the Future in US theaters. This date marks the first appearance of Doc Brown (Emmett Lathrop Brown), a fictional scientist created by Robert Zemeckis and Bob Gale.

This is the date Doc Brown invents time travel. He slips and hits his head while trying to hang a clock, and conceives the idea for the flux capacitor. This is a pivotal moment in the Back to the Future storyline, enabling the entire series' plot. It is also referenced in the film when Marty travels back to this date.

According to the Back to the Future novels, this is the birth year of Emmett Lathrop Brown, also known as Doc Brown. This would make him 65 years old in 1985, the year of the first film's primary setting. This date establishes the character's age within the narrative timeline.