HP birthdays

[Michelle]

I never know the answer to this, either.  I like to believe that she didn't send 
the telegram, that it was some sort of joke from F&G.  But, she was kind of silly 
then, and smitten with Harry, so I wouldn't put it past her.  
I, like Alora, care about Ginny's birthday (and the telegram) because I am all 
for OBHWF, which means Harry HAS to end up with Ginny.  (Don't hate me if 
you disagree, I won't hate ya'll, either.)  
Does anyone know what year Hermione was born?  I have heard so many 
conflicting things about this.  Most people have adopted 1980 as her year of 
birth, but does anyone know for sure?

Michelle