30 December is the 364th day of the year (365th in leap years). There is 1 day remaining until the end of the year.
- 1997: Harry Potter, Hermione Granger, and Ron Weasley visit Xenophilius Lovegood, who tells them of the legend of the Deathly Hallows. In an attempt to get his daughter Luna back from the Death Eaters, Xenophilius attacks them, but the trio manages to escape via disapparition. 
- 30 December on Wikipedia