It is from the successful musical Call Me Madam, which was later adapted as a movie. Perry Como and Doris Day had single records of the song that made pop charts of the day, and Ethel Merman recorded it as well.
A recording by Perry Como and The Fontaine Sisters with Mitchell Ayres and his orchestra was made in New York City on July 26, 1950. It was released by RCA Victor Records as catalog number 20-3945 (in USA) and by EMI on the His Master's Voice label as catalog number B 10221.
It's a lovely day today So whatever you've got to do You've got a lovely day to do it in, that's true
And I hope whatever you've got to do Is something that can be done by two For I'd really like to stay
It's a lovely day today And whatever you've got to do I'd be so happy to be doing it with you
But if you've got something that must be done And it can only be done by one There is nothing more to say
Except it's a lovely day for saying It's a lovely day