Wikipedia has a list of predicted dates for when apocalypse strikes, because of course it does. For kicks and giggles, Jeff Fletcher put the dates on a timeline. The horizontal position of each dot represents the predicted date. The vertical position doesn't mean so much, other than there are a lot of dates around that time.
Luckily, we got past the most recent September 1, 2015 prediction and the grip of ones before that. Phew. Next up: 2020.