Listen to I Didn't Know What Time It Was online. I Didn't Know What Time It Was is an English language song and is sung by Billie Holiday. I Didn't Know What Time It Was, from the album For Lovers - Sarah Vaughan, Billie Holiday, Nina Simone, was released in the year 2005. The duration of the song is 5:59. Download English songs online from JioSaavn.