Joke is on you. April has 30 days so that’d be May 1 which makes even less sense.
Oh bother.
If the Europeans tried to celebrate Pi Day on 31-4, they’d have a problem because it doesn’t exist, which I tried to make into a joke, but some here overthink the humor…..
We do it on 3-14 because we write our dates as MMDDYY, not DDMMYY….