JKR's site and significance of 2563

[Jason]

 mstattersall wrote:
 Here's a theory--maybe it's the date THIS year when the official 
 announcement of publication will occur. I base this guess on the 
fact 
 that OotP was released on 21 June last year, which was a Saturday, 
 and 19 June is also a Saturday. The significance of 2563 escapes, 
> > though--

SNIP

Jason here:

I doubt this is anything more than a coincidence but, June 19th 2004 
is about 2576 days after June 20th 1997. When was Philosophers stone 
first published? Late June 97, right? Possibly 2563 days before 
6/19/04?