4 September is the 247th day of the year (248th in leap years). There are 118 days remaining.
- 1991: The Gryffindor First years have their first Astronomy Class at midnight, on the top of the Astronomy Tower.
- 1992: The Second years have a Charms class in the morning.
- 1994: Bartemius Crouch Jr. (impersonationg Alastor Moody) teaches the Fourth year students about the Unforgivable Curses.
- 1995: Harry has his second detention with Dolores Umbridge.