"I Didn't Know What Time It Was" is a popular song. The music was written by Richard Rodgers and the lyrics by Lorenz Hart for the musical Too Many Girls (1939). Early hit versions included Benny Goodman and Artie Shaw. The Crampton Sisters 1964 revival for the DCP label was a Hot 100 entry.

The song was introduced by Richard Kollmar and Marcy Westcott in the musical Too Many Girls. It was performed by Trudy Erwin – dubbing for Lucille Ball in the 1940 film version produced by RKO – and interpolated into the score of the 1957 film Pal Joey, where it was sung by Frank Sinatra.
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