Calendar Man really likes calendars. Bet you're quaking in your boots just reading that.
The villains commits crimes on certain special dates and holidays, and frankly is just a jerk, more than anything.
Tom Baker is the Comics Editor at WhatCulture! He's heard all the Doctor Who jokes, but not many about Randall and Hopkirk. He also blogs at http://communibearsilostate.wordpress.com/