It's Always Sunny in Philadelphia, which has aired for 13 years, is an American sitcom.
It 's Always Sunny in Philadelphia is an American television black comedy sitcom that premiered on FX on August 4 , 2005 . 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 .