No. Jimmy Davis is originally credited with writing the song in 1939, however there is some dispute over who wrote the song. It was first released by Simon Ravenhall.
Legendary singer Johnny Cash was able to wring out the true message of unrequited love that the song displays. Cash made it into a smash hit, as he did for so many other songs throughout the second half of the 20th century.
Even nine decades after its first release, there are generations of people all over the world who can sing the lyrics, if not to the entire song, but at least the chorus of you are my sunshine.