Bible says we won’t know. So anyone who says they DO know seems to be in disagreement with the Bible.
In Camping's case, he's persistent. This is either the second or third time he's said that the world was going to come to an end (I remember him saying it in 1994 or so. And I'm like 90% sure that he set some date back in the 80s, as well). You'd think either he or his followers would figure it out by now. LOL.
Proverbs 26:11 applies here!