How many times does the world have to end before they get it right?
1914: Jehovah's Witnesses: Armageddon.
1915: Jehovah's Witnesses: Armageddon.
1918: Jehovah's Witnesses: Armageddon.
1920: Jehovah's Witnesses: Armageddon.
1925: Jehovah's Witnesses: Armageddon.
1941: Jehovah's Witnesses: Armageddon.
1975: Jehovah's Witnesses: Armageddon.
mid-1970s: David Wilkerson: Worldwide economic depression.
1977: William Branham: Destruction of the U.S., termination of all governments into a world government, Second Coming.
1977: Pyramidologist Adam Rutherford: Beginning of the Millennium.
1978: Jim Jones took his cult with him.
1979-1980: John Todd: Installation of a world government ruled by the Illuminati, with Jimmy Carter as the anti-Christ.
1980: Pat Robertson: "A year of sorrow and bloodshed that will have no end soon, for the world is being torn apart, and my kingdom shall rise from the ruins of it."
1981: Hal Lindsey: Pre-tribulational rapture.
1982: Pat Robertson: Great Tribulation.
1982: R.E. McMaster: World War III and/or economic depression, based on cyclical theory.
1985: Pat Robertson: Worldwide economic collapse.
1988: Hal Lindsey: Second Coming.
1988: Edgar Whisenant: Second Coming.
1988: Colin Deal: Second Coming.
1989: Edgar Whisenant: Second Coming.
1990: Elizabeth Clare Prophet: Global thermonuclear war.
1991: Louis Farrakhan: The looming Gulf War would be the "War of Armageddon which is the final war."
1992: Rollen Stewart: Second Coming.
1992: Mission for the Coming Days: Second Coming.
1994: Harold Camping: Second Coming.
1994: Some Jehovah's Witnesses: Armageddon.
1997: Heaven's Gate: Earth changes and a UFO abduction coinciding with the Hale-Bopp comet. Mass suicide in the hopes of hitching a ride on said UFOs.
1997: Jehovah's Witnesses: Armageddon.
1998: The Church of the SubGenius: the Rupture. Every year on July 5th, they meet and party in reverence, certain that it will happen this year. (Recent writings have inverted the year to "8661.")
1999-2000: David Wilkerson: Worldwide economic depression.
2000: Y2K: Collapse of civilisation.
2003: George W. Bush claimed that Operation Iraqi Freedom was necessary "to thwart Gog and Magog, the Bible’s satanic agents of the Apocalypse." (Plan no longer in progress.)
2005-2026: William Strauss and Neil Howe: A crisis period in the U.S. comparable in effect to the American Revolution, Civil War, and Great Depression/WWII.
2007: Hal Lindsey: Second Coming.
2007: Pat Robertson: Great Tribulation.
2008: Ronald Weinland: Start of the final years of Man's rule on Earth.
2008: Sarah Palin: believes she is of the "Final Generation" and will see the End Times during her lifetime.
2008: The Large Hadron Collider will destroy the world with black holes, strangelets or something similarly scary and sciencey. (You can keep up to date with whether this has happened yet here.)
2009: David Wilkerson: Earth-shattering calamity engulfing the whole megaplex, including areas of New Jersey and Connecticut. Major cities all across America experiencing riots and blazing fires.
2011: Harold Camping: Second coming/rapture. May 21st, to be precise. He put up billboards! Later postponed to October 21st, but again nothing came of it. Camping will hold on to the money people sent him for the time being or for good, though followers were encouraged to drain their savings for Camping's campaign funds and many are deeply disappointed.
2012: But of course! Un-naturally failed apocalypse, NASA pushed away space rock expected to hit in series of attempts to bombard asteroids in previous years. (They even did this to the moon!) The following trail fell to/passed Earth in early 2013.
2013: 2012 was just a warm up, the real bad stuff starts 2013 or something and it seems Isaac Newton predicted it.
2014: World War III, resurrected Nostradamus prophecy of a fire in the North for the reference of the end of the age of the fifth sun, believed to be a specific Northern region of a country, current speculation is North Korea, as relative to the resolution of a Pope prediction. Oh, and the Rapture.  And a giant asteroid hitting the Caribbean.
between April 2014 and October 2015: A tetrad of lunar eclipses (or blood moons) will signal the start of the end times, according to megachurch pastor John Hagee. 
Unspecified time during the reign of Pope Francis, the pope succeeding Benedict XVI. Mediaeval Saint Malachy supposedly predicted Peter the Roman (Petrus Romanus) would be the last pope, Rome would be destroyed and a terrible judge would judge his people, The end. Doomsayers have already started shoehorning the new pope into the prediction.
2016: Tom Wattkins: He had a vision of the Great tribulation claiming to have met the beast of revelation, etc. Turns out the same day is a solar eclipse., though of course he'll mention that.
2017: Various Christians: We'll be chipped, and the Great Tribulation begins.
2018: Hal Lindsey: Second Coming.
2028: Fred Clark: A tongue-in-cheek offer guaranteeing 15 years of Bible-prophecy hucksterism for four easy payments of $39.99.
2030: Approximate date of a mass extinction event predicted by Bob Geldof. Myles Allen, of Oxford University claims "Competing hyperbole" are unhelpful in understanding real climate change. 
2036: More asteroids.
2037: Hal Lindsey: Third Coming.
2038: Deteteoration of the fundamental older technology that still underlies the most crucial systems today.
2040: Even more asteroids.
2039: End of life, the universe and everything. Also known as the Ascension
Ha ha ha.... You marginalized creepy fool.