It's Always Sunny in Philadelphia is an American sitcom that premiered on FX on August 4, 2005, and moved to FXX beginning with the ninth season in 2013. 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-absorbed friends who run the Irish bar Paddy's Pub in South Philadelphia.
On April 1, 2016, the series was renewed for a 13th and 14th season, which will tie it with The Adventures of Ozzie and Harriet as the longest-running (in number of seasons) live-action sitcom in American TV history. Season 13 premiered on September 5, 2018.