Harry Potter

BBC article: https://www.bbc.com/news/articles/ckgwd7v8r17o

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What is the earliest mention of Draco's birthday?

Both harrypotter.fandom.com and hp-lexicon.org list 1980 June 5th as his birthday. A JKR tweet does confirm this, but as it was a reply to another user, it seems as though this was already known. Where was the date published prior to 2015?

I don't believe the exact date is ever mentioned in any of the books, though upper and lower bounds could be established based on what year he is in and when he is eligible for apparition tests and such.

Any thoughts?

CoS17:

‘I’m going to be expelled!’ Ginny wept, as Harry helped her awkwardly to her feet. ‘I’ve looked forward to coming to Hogwarts ever since B-Bill came and n-now I’ll have to leave and – w-what’ll Mum and Dad say?’

This comment seems slightly strange once you calculate that Ginny was barely a year old when Bill left for Hogwarts. I guess she was a precocious baby?