Calendar Man is fascinated by dates and calendars – even his real name is a pun on the Julian and Gregorian calendars. His crimes always have a relationship to the date that they are committed. The theme may be related to what day of the week it is or to a holiday or to a special anniversary on that date; he will plan his crime around that day. He often wears different costumes which correspond to the significance of the date, though he does have a main costume which has various numbers (meant to represent days on a calendar) sprouting from the shoulders.
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History
Calendar Man eventually joined the short-lived "Misfits"; a group of under-appreciated Batman foes.
Much later, Calendar Man was being treated at Arkham Asylum, when a serial killer named Holiday began killing Gotham's mob bosses on holidays. Calendar Man agreed to help Batman, but only because he believed that he was "being forgotten". Calendar Man deduced that the killer was Alberto Falcone but hid the information from Batman. After escaping Arkham, Calendar Man tortured Alberto by pretending to be the ghost of his late father Carmine, telling him to take over the Five Families of the Mafia. Calendar Man attempted to kill Alberto, but was attacked by Sofia Gigante. Gigante ruthlessly beat the Calendar Man, and broke his jaw. The Calendar Man was later found by police and taken back to Arkham. Another holiday-themed killer surfaced called Hangman.
