Julian Gregory Day, better known as Calendar Man, is known for committing crimes that corresponded with holidays and significant dates. He often wears costumes to correlate with the date of the designated crime. Because his crimes are generally petty and often ridiculous in nature, he is notorious among both heroes and villains alike for being something of a joke. He has fought Batman and Robin on many occasions. Fixated on the calendar, Day oftentimes and ties his crimes to certain holidays throughout the year. This often leads him to leaving clues by which he could be caught. Gotham City's hopes for a day off are often clouded by the knowledge that any holiday of note is likely to be shadowed by Calendar Man's presence.