Cedric is a fifth-year in PA, which takes place in 1993-1994. In GF, then, he's a sixth year student, but he's old enough to participate in the Triwizard Tournament, just like Angelina Johnson. Like her, his birthday must be in the early fall, between the beginning of school and October 31.
Cedric Diggory is born
Date circa September, 1977
Certainty Inferred from canon
Location in Canon GF16: The Goblet of Fire
Type of Event Wizarding world
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