"What a Diff'rence a Day Made '', also recorded as "What a Diff'rence a Day Makes '', is a popular song originally written in Spanish by María Grever, a Mexican songwriter, in 1934 with the title "Cuando vuelva a tu lado '' ("When I Return to Your Side ''). The song is also known in English as "What a Diff'rence a Day Makes '', as popularized by Dinah Washington.
who sang the original what a difference a day makes
María Grever