FNAF2>FNAF1> FNAF3
FNAF2 is a prequel to FNAF1 because it takes place in the year of 1987, the year the bite of 87 occurred. I think FNAF1 takes place in 1993 or somewhere around that. With the recent FNAF3 news it is now official that FNAF3 takes place 30 years after the events of FNAF1, the original. If you add 30 years to 1993(the year I think FNAF1 takes place in) the year that FNAF3 probably takes place in 2023.