Charles Peckham Day (born February 9, 1976) is an American actor, writer, and producer. He is best known for playing Charlie Kelly on the FX dark comedy It's Always Sunny in Philadelphia (2005–present), which he stars with Rob McElhenney, Kaitlin Olson, Glenn Howerton and Danny DeVito, and he is also a writer and an executive producer. In 2011, he was nominated for a Critics' Choice Television Award and a Satellite Award for the role. He subsequently co-created the Fox sitcom The Cool Kids (2018–2019) with Paul Fru