12 August is the 224th day of the year (225th in leap years). There are 141 days remaining.
- Ernie Macmillan's check-out of Quidditch Through the Ages from the Hogwarts Library ends.
- 1992: Hogwarts Letters and Schoolbook lists arrive. Harry Potter, Ron, Fred and George Weasley practice Quidditch in the Weasleys' paddock. 
- 1995: Harry Potter's disciplinary hearing takes place in Courtroom Ten, at the Ministry of Magic, at eight AM (despite being scheduled for nine AM). Harry is cleared of all charges with the help of Albus Dumbledore and Mrs. Figg. 
- 12 August on Wikipedia