Calendar Man
Comic book character
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Calendar Man is a supervillain appearing in American comic books published by DC Comics, as an enemy of the superhero Batman, belonging to the collective of adversaries that make up Batman's rogues gallery. Calendar Man is known for committing... Wikipedia
Powers and abilities: Genius-level intellect
Creators: Bill Finger and Sheldon Moldoff
Alter ego: Julian Gregory Day
First appearance: Detective Comics #259 (September 1958)
Team affiliations: The Misfits; Time Foes