Best Day of My Life

“Best Day of My Life” is a song by American indie rock band American Authors. The song was written by band members Zac Barnett, Dave Rublin, Matt Sanchez, and James Adam Shelley, along with producers Aaron Accetta and Shep Goodman. “Best Day of My Life” was originally recorded for release as a single by Mercury Records and Island Records on March 19, 2013, and later appeared as the second track on the band’s third extended play American Authors (2013) and the third track on their debut studio album, Oh, What a Life (2014).