30 April is the 120th day of the year (121st in leap years). There are 245 days remaining until the end of the year.
- 1662: Mary II, Queen of England and wife of King William III, is born.
- 1998: Remus Lupin visits Shell Cottage to announce the birth of his son and names Harry Potter godfather. Also, Garrick Ollivander is safely escorted to an Order of the Phoenix hideout by William Weasley, who returns his aunt's tiara.