So ever since FNAF 4 came out there has been a large debate about if Fredbear's Family Diner was in 1983 or 1987. Well, here's proof to show the game takes place in 1983!
The first thing I would like to bring attention too is FNAF 2. In this game Golden Freddy is present, and since Fredbear is Golden Freddy then how could he be in two places at once? And I know what your thinking, "But Tyler! Golden Freddy is just a hallucation!", well he's not! And all the proof I need is the FNAF 2 Custom Night screen. Golden Freddy is on that screen, and if he wasn't real then Fritz wouldn't be able to mess with his AI level. And we already know from FNAF 3 that hallucinations can't kill you.
I'd also like to mention a little quote said by Phone Guy on Night 6: "Uh, we're going to try to contact the original restaurant owner. Uh, I think the name of the place was..."Fredbear's Family Diner" or something like that. It's been closed for years though, I doubt we'll be able to track anybody down."
It's been closed for years. If Fredbear's Family Diner was in 1987 then Phone Guy wouldn't say that and he wouldn't sound like he barely knows the name of the place.
And there's the FNAF 4 minigames, in one of the minigames we can turn on the TV to see a show called Fredbear and Friends 1983. This doesn't confirm much but why would Scott put 1983 for one small reason, doesn't make much sense. And sure, in the teasers there were 8's and 7's put into the source codes but so were 3's in some of the teasers!
Another thing in the FNAF 4 minigames is the little girl with her toys in the playground. Notice how the toy Chica is missing her beak. After Fredbear's Family Diner and the original Freddy Fazbear's Pizza closed the company tried to take a safer route by scrapping the old animatronics and making new one's based off the toys they used to sell. They sold plushies, why not toys too?
You know what else? No one ever mentioned FNAF 2 having a sister location, but you know which restaurant did? The original Freddy Fazbear's Pizza! FNAF 3's night 4 phone call proves this: "Uh, hello? Hello, hello! Uh, there's been a slight change of company policy concerning use of the suits. Um, don't. After learning of an unfortunate incident at the sister location, involving multiple and simultaneous spring lock failures, the company has deemed the suits temporarily unfit for employees. Safety is our top priority at Freddy Fazbear's Pizza, which is why the classic suits are being retired to an appropriate location, while being looked at by our technician. Until replacements arrive, you'll be expected to wear the temporary costumes provided to you. Keep in mind that they were found on very short notice, so questions about appropriateness/relevance should be deflected. I repeat, the classic suits are not to be touched, activated or worn."
There is a lot more evidence towards FNAF 4 being in 1983 than there is 1987. FNAF 4 was in 1983, Fredbear caused a bite, but not the bite of 87. Thanks for reading!