By now the list of Ends of the World is much longer than the one which was known in the times of Mary Gulliver. This phenomenon, of blind belief in that which has been proven time and time again to be false, testifies to the amazing talent of Man to learn nothing. It's probably comforting to ignore accumulated knowledge while giving in to induced fear.
Mary would have been a witness, or would have remembered stories about the world’s due endings in:
1666 (1000 =millennium + 666 =number of the Beast. The Great Fire of London in 1666 was for many a token of the validity of this prediction;
1688 (doomsday calculation #1 of John Napier's, a mathematician who was better at discovering logarithms than at predicting the End of the World. Many a pupil struggling with logarithms would rather he was right about the End of the World. Me too.)
1700 (doomsday calculation #2 of John Napier's, based on the Book of Daniel.)
John (Henry) Archer, a Fifth Monarchy Man claimed that the World As We Know It would end on January 1st, 1700, in his 1642 book “The Personal Reign of Christ Upon Earth.”