April Fools' Day
US /ˌeɪ.prəl ˈfuːlz ˌdeɪ/
UK /ˌeɪ.prəl ˈfuːlz ˌdeɪ/

1.
Prima Aprilis
April Fools' Day is an annual custom on April 1 consisting of practical jokes and hoaxes. The jokesters often expose their actions by shouting "April Fools!" at the recipient.
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On April Fools' Day, my brother tricked me into believing he won the lottery.
W Prima Aprilis mój brat oszukał mnie, że wygrał na loterii.
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Many news outlets participate in harmless pranks on April Fools' Day.
Wiele serwisów informacyjnych bierze udział w nieszkodliwych żartach w Prima Aprilis.