January 21 is the 21st day of the year.
- 1971, Thursday:
- After an elderly Biff Tannen made himself rich by traveling back to 1955 to give his younger self a Grays Sports Almanac, his younger self became a millionaire by gambling as he knew the results before they happened. With his wealth, Biff wanted a mansion in Hill Valley. He barged into the Hill Valley City Council meeting, and demanded that his mansion plans be approved. Council member Goldie Wilson stated that the decision had to be unanimous, but Stanford S. Strickland vocally disapproved of the plans.
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