Hogwarts functioning during missing 24 hours

[Geoff Bannister]

No: HPFGUIDX 140517

--- In HPforGrownups at yahoogroups.com, "M.Clifford" <Aisbelmon at h...> 
wrote:
> --- In HPforGrownups at yahoogroups.com, fuzzlebub85 at a... wrote:
> > Elyse:
> > I dont know if we can be sure that Mcgonagall was at  Hogwarts.
> > I presume Hogwarts was closed at the time of Harry's attack.
> > I  mean, Harry's birthday is always during the summer holidays,
> > at which time  Hogwarts is closed for the vacation.
> > So if Harry was attacked on his first  birthday, Hogwarts must 
have 
> > been closed, and the teachers were on  vacation.
> > (snips the rest)
> >  
> > Kaylee: Sorry to disagree, Elyse. Harry was attacked on 
Halloween. I  
> > remember this clearly, but feel rather foolish for not having 
PS/SS  
> > on hand. *glances around* Anyone have the relevant canon?
> 
> Valky:
> I think it's in another book not PS/SS, maybe POA. 
> In any case I agree, I do recall that canon places Harrys age at 15
> months, which would be approximately the end of October.

Geoff:
Tsk, tsk, it's clearly there in Philsopher's Stone:

'"Now, yer mum an' dad were as good a witch an' wizard as I ever 
knew. Head Boy an' Girl at Hogwarts in their day! Suppose the myst'ry 
is why You-Know-Who never tried to get 'em on his side before... 
probably knew they were too close ter Dumbledore ter want anythin' 
ter do with the Dark Side.
Maybe he thought he could persuade 'em... maybe he just wanted 'em 
outta the way. All anyone knows is, he turned up in the village where 
you was all living, on Hallowe'en ten years ago. You was just a year 
old. He came ter yer house an' - an'-"
Hagrid suddenly pulled out a very dirty spotted, handkerchief and 
blew his nose with a sound like a foghorn.'

(PS "The Keeper of the Keys" p.43 UK edition)

So this places it on 31st October 1981.