Calendar Man

Julian Day (a.k.a. Calendar Man) is a villain from the Batman series. He is overly fixated on calendars, days and dates. He plans his crimes on certain days of the year.

Batman: Arkham Asylum
Calendar Man doesn't appear in the game Batman: Arkham Asylum. One of the Riddler's riddles revolves around him.

He has an entry in the Character Bios. His profile states:

Fixated on the calendar, Julain Day became Calendar Man, a villain who timed and tied his crimes thematically to certain holidays throughout the year, often 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.

Facts
Real Name: Julian Day

Occupation: Professional Criminal

Base of Operations: Gotham City

Eyes: Blue

Hair: Brown

Height: 6 ft 3 in

Weight: 175 lb

First Appearance: Detective Comics #259 (September, 1958)

Attributes

 * Obsessed with quirks of the calendar
 * Carefully plans and themes crimes around holidays