June 12 is the one hundred sixty-third day of the year. There are two hundred two days remaining of the year.
- 1893, Monday: The Brown family (consisting of Emmett, Clara, Jules and Verne) attempt a trip to 1985, but fail.
- 1968, Wednesday: Marty McFly is born to George and Lorraine McFly.
- 1990, Tuesday: The Secrets of the Back to the Future Trilogy is first transmitted in the United States.