It's Always Sunny in Philadelphia (sometimes referred to as It's Always Sunny, Always Sunny or simply Sunny) is an American television sitcom that premiered on FX on August 4, 2005. It moved to FXX for the ninth season. It was created by Rob McElhenney, who developed it with Glenn Howerton. It is executive produced and primarily written by McElhenney, Howerton, and Charlie Day, all of whom star alongside Kaitlin Olson and Danny DeVito. The series follows the exploits of "The Gang", a group of self-centered friends who run the Irish bar Paddy's Pub in South Philadelphia.