It didn’t stop As It Happens from pulling one this evening, though. (They had a guy from the Mint claiming that they were pulling the $5 bill and replacing it with a $3 coin. They were soliciting suggestions from the public as to what to put on it, suggesting famous Canadian triumvirates. I phoned in suggesting they instead continue the wildlife theme and put a fish on it; we could call it the fishy, or in French, the poisson d’avril.)
Then you do it after midnight the ‘day before’. Grew up in Ohio and Upstate New York, and it’s always been the rule for me. Then again, my parents are Brits, which might have had something to do with it.
I’ve only ever heard of it this year in relation to April Fool’s Day, the first instance where I saw it mentioned was on an Irish message board so it must be common enough here too.
FWIW yesterdays’ April Fool article in our local paper made the victims turn up at a local bar at 19 o’clock, and apparently nobody cried foul because of the time of day.
Speaking as a teacher in Nova Scotia, Canada: April Fools’ Day ends at noon. No ifs, ands or buts. I can only stand so many lame attempts at practical jokes.
Bingo. My sense is that the “rule” was invented by parents (and/or teachers) to stop repetetive boring stuff from kids flogging the horse to death. Then the kids who were told “No pranks after noon” grew up with the rule and perpetuated it.