Well .. I don't believe that - and the Bible says - NO ONE KNOWS WHEN THE END WILL COME - NOT EVEN THE SON - ONLY THE FATHER KNOWS (and He's not telling).
However, Paul taught believers, "It has been given unto you to know the mysteries and secrets of the Kingdom."
So .. believe me .. there will be an event which will get the world's attention and everybody will know.
Actually if you get hit by a truck crossing the street, as far as you are concerned, the world ended. So why worry about it and just watch for trucks.