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 crimes that correspond with holidays and significant dates. He often wears costumes to correlate with the date of the designated crime. His name is a reference to the Julian and Gregorian calendars. In his debut, the character was presented as a joke villain, but in later years, writers developed Calendar Man as a dark, disturbed criminal who toys with Batman.

The Suicide Squad is a 2021 American superhero film based on the DC Comics team Suicide Squad. Produced by DC Films, Atlas Entertainment, and the Safran Company, and distributed by Warner Bros. Pictures, it is a standalone sequel to Suicide Squad (2016) and the 10th film in the DC Extended Universe (DCEU). The film was written and directed by James Gunn and stars an ensemble cast including Margot Robbie, Idris Elba, John Cena, Joel Kinnaman, Sylvester Stallone, Viola Davis, David Dastmalchian, Daniela Melchior, Michael Rooker, Jai Courtney, Peter Capaldi, Alice Braga, and Pete Davidson. In the film, several convicts join a task force known as the "Suicide Squad" in exchange for lighter sentences. They are sent to the South American island nation of Corto Maltese to destroy all traces of the giant alien starfish Starro the Conqueror before it falls into the local government's control.