April 10 is the 100th day of the year.

Event

• 1933, Monday: This was the last day of the Bob Brothers All-Star International Circus' performance in Hill Valley.^[1]

Behind the scenes

• 1888, Tuesday: This was planned as the date that Doc wrote his letter for Marty as opposed to September 1, 1885.

Appearance

• Paradox script
• Back to the Future: The Animated Series
  • "Verne's New Friend"

Reference