"Greatest Day" is a song by British singer Beverley Knight, released as the fifth single from her second studio album, Prodigal Sista (1998), on 5 July 1999. The track contains a re-recorded sample of "Act Like You Know" by American R&B group Fat Larry's Band. "Greatest Day" became Knight's highest-charting single up to that point when it peaked at number 14 on the UK Singles Chart. The music video for the song was shot by director Jake Nava, who had previously shot Beverley's "Made It Back '99" video. Track listings UK CD1 "Greatest Day" (classic mix) "Weekend Thing" "Greatest Day" (Ruffland mix) UK CD2 "Greatest Day" (classic mix) "Greatest Day" (Curtis & Moore 12-inch mix) "Greatest Day" (two step mix) UK cassette single "Greatest Day" (classic mix) "Greatest Day" (Ruffland mix) Dutch CD single "Greatest Day" (classic mix) "Weekend Thing" Personnel Personnel are taken from the UK CD1 liner notes. Beverley Knight – writing, vocals Pule Pheto – writing Neville Thomas – writing Mark Birts – writing ("Act Like You Know") Terry Price – writing ("Act Like You Know") Nicholas J. Martinelli – writing ("Act Like You Know") Rob Harris – guitar Derrick McIntyre – bass Mike Spencer – keyboards, production Shane Meehan – drums The Horny Horns – horns Elisa – strings Andy Kowalski – mixing Dillon Gallagher – initial programming Simon de Winter – initial programming Charts References 1998 songs 1999 singles Beverley Knight songs Music videos directed by Jake Nava Songs written by Beverley Knight Songs written by Neville Thomas Songs written by Pule Pheto