"It's a Hap-Hap-Happy Day" is a popular song with words by Sammy Timberg & Winston Sharples and music by Al J.
Neiburg.
[1] It was featured in the animated feature film Gulliver's Travels in 1939.
[1] It was a hit in the UK in 1940 during the Battle of Britain, having been played heavily on BBC radio.
[2] [3][4][5][6]