Claim: It's Always Sunny in Philadelphia airs on a channel.

It 's Always Sunny in Philadelphia is an American television black comedy sitcom that premiered on FX on August 4 , 2005 . It moved to FXX beginning with the ninth season , and has remained there since . 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 .   The series was renewed for a twelfth season that premiered on January 4 , 2017 . On April 1 , 2016 , the series was renewed for a thirteenth and fourteenth season , which will tie it with The Adventures of Ozzie and Harriet as the longest running live-action sitcom in American TV history .