The Calendar ManReal Name: Julian Day
First Appearance: Detective Comics #259
Julian Day, a.k.a. The Calendar Man, is obsessed with the dates on the calendar. So obsessed in fact that it has driven him insane and, of course, pointed him towards a life of crime.
All of his crimes follow a theme that corresponds with the day of the calendar. Day even crafted a garish costume complete with pages from a calendar pasted onto the shoulders and red spandex.
However, none of his schemes ever worked and he is now best known for his cameo in Batman: The Long Halloween, where he learns that someone else is using his calendar gimmick and actually succeeding with it. Trademark FAIL.