Hoax alert! You might have seen a meme floating around the internet that claims “(Current year) is the first time in 666 years that Halloween falls on a Friday the 13th!”
The truth is, it’s a gullibility joke. Halloween is, and has always been on October 31st (or, between the 31st and November 1st in it’s early days.)
And there’s the fact that Halloween is not even 666 years old.
Don’t worry. If you’ve been duped, so have lots of folks. Take look at the calendar, you’ll see that Halloween is on the 31st this year as always. Just be sure that if you’re going to a Halloween party, you show up in costume on the correct date.