I wonder how many times people have said that the world was going to end..
ca. 2800 BC:
According to Isaac Asimov's Book of Facts (1979), an Assyrian clay tablet dating to approximately 2800 BC was unearthed bearing the words "Our earth is degenerate in these latter days. There are signs that the world is speedily coming to an end. Bribery and corruption are common." This is one of the earliest examples of the perception of moral decay in society being interpreted as a sign of the imminent end.
Late 4th Century:
St. Martin of Tours (ca. 316-397) wrote, "There is no doubt that the Antichrist has already been born. Firmly established already in his early years, he will, after reaching maturity, achieve supreme power."
1998:
The year of the Rapture, claimed Donald B. Orsden in his book The Holy Bible - The Final Testament: What is the Significance of 666?. "Take your super computers, you scientists, and feed the number 666 into them. The output will be the proof God gives that 1998 is the year Jesus will take the faithful with him...."
Early 21st Century:
In 1143, St. Malachy prophesied that there would only be 112 more popes left before the end of the world. Pope Benedict is the 111th, which means that the world will end in the early 21st century.
Dec 31, 2011:
Solara Antara Amaa-ra claims that there's a "doorway of opportunity" lasting from January 11, 1992 to December 31, 2011 in which humanity is given the final chance to rid itself of evil and attain a higher level of consciousness, or doom will strike.
2012:
James T. Harmon's Rapture prediction #3. (Oropeza p.89)
Dec 21, 2012:
Terence McKenna combines Mayan chronology with a New Age pseudoscience called Novelty Theory to conclude that the collision an asteroid or some "trans-dimensional object" with the Earth, or alien contact, or a solar explosion, or the transformation of the Milky Way into a quasar, or some other "ultranovel" event will occur on this day.
Dec 23, 2012 :
The world to end, according to the ancient Mayan calendar.
And finally March 21, 2011. Wasn't the earthquake supposed to be at like 6 PM *looks at phone* Uhh it's 6:45 where I am..guess it is running late.