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February 29 is established as Superman's official birthday, as designated in DC Comics' 1976 Super Calendar.

DC Comics chose leap day (February 29) as Superman's birthday because the date occurs only every four years, explaining why Superman remains "young" despite appearing in comics for generations.

The town of Metropolis in Southern Illinois was proclaimed the "Hometown of Superman" by the Illinois House of Representatives on June 9, 1972.

Superman's birth date has varied throughout his comic book history, but February 29 is the only date officially celebrated by DC Comics in recent years.