Ernie Macmillan is born

Ernie’s family is pure-blood and seems to be somewhat aristocratic, but Ernie doesn’t inherit an attitude of pure-blood superiority. He is born in 1980, along with many other students of Harry’s year, although some, like Hermione, would have been born in 1979.

Timeline Notes

We know Ernie was born in 1980 because he, Harry, and Draco Malfoy are the only students who are not yet old enough to Apparate on the day of the test in HBP22.