1 April, also known as April Fools' Day, is the 91st day day of the year (92nd in leap years). There are 274 days remaining in the year.
- 1978: Fred and George Weasley are born to Arthur and Molly Weasley.
- 1979: Caractacus Phelps explodes eight-hundred Stink Pellets by dropping them from the roof of the Daily Prophet main offices in Diagon Alley.
- 1992: The Gryffindor first years have an Astronomy class at midnight, on the top of the Astronomy Tower.