Well, it's hard to say for sure. Release dates can change, but usually, you can find out by checking the publisher's website or relevant literary news sources.
The FNAF novels tend to tie in with the games when they expand on the game's mysteries or provide deeper insights into the characters and settings. It could be in the form of prequels or sequels that complement the game's narrative.
The making of the Christmas story occurred at a certain point in time. Unfortunately, I don't have that information readily available. You might be able to find out by consulting reliable sources like film archives or entertainment news.