No… it’s not an “April Fools” joke… in France April 1st is called “Poisson d’Avril” (or “April’s Fishes” in English) another version of a prank day when people try to stick paper fish cut-outs to each others’ backs. It is kind of fun, and something different.
I also learned today that in Iran there is a version of April Fools day (which actually pre-dates the Western tradition) called Sizdah Be-dar, a prank day that marks the end of the Iranian new year. Apparently versions of Sizdah Be-dar have been celebrated since 536 BC which have led many to believe that this festival might be the origin of the western version of April Fools.
There is your “cultural” moment of the day :)