The version I was referring to is the UK edition (clearly that means I'm from the UK). Don't know whether it's in any of the other editions, although I can't exactly understand why they'd take it out. Also, it serves a pretty important purpose, because, as Harry tries to escape the dwarf who gives him the Valentine, his bag gets ripped and Tom Riddle's diary falls out, thereby alerting Ginny to the fact that Harry has got it. Therefore, if it isn't in the Dutch edition, how does Ginny find out Harry's got the diary?

By the way, I think the chapter in question is called The Very Secret Diary. Can't remember the chapter number and I'm too lazy to go and look it up.