That would only have changed if the year he started Hogwarts changed, which it did not. The birth date didn’t change by a whole year, just from late enough in 1926 to enter Hogwarts in 1938 to early enough in 1927 to enter Hogwarts in that same year.
(I lost track of what you were trying to argue, and the comment in isolation seemed to suggest that the non-trivial change had happened. A clause like “so the fact that this was carefully kept constant is evidence in favor of …” would have helped. )
That would only have changed if the year he started Hogwarts changed, which it did not. The birth date didn’t change by a whole year, just from late enough in 1926 to enter Hogwarts in 1938 to early enough in 1927 to enter Hogwarts in that same year.
Yes. Exactly. That’s my point.
(Not sure why you said this.)
(I lost track of what you were trying to argue, and the comment in isolation seemed to suggest that the non-trivial change had happened. A clause like “so the fact that this was carefully kept constant is evidence in favor of …” would have helped. )