Harold Camping, 89 years-old, with a $100-million ministry that broadcasts radio in 61 different languages around the world, has just failed. He predicted Doomsday on 21st May, 2011, but the world is still here.

He was so sure about his prediction that he used words like guaranteed and without any shadow of doubt. He has widely promoted it since 2010 with massive advertising campaigns.

Camping said he has studied the Bible for nearly 70 years and developed a mathematical system to interpret prophecies hidden within the Bible.

It is not the first time he made a failed prediction of Doomsday.

He had previously predicted that Rapture would occur in September 1994 and waited together with his followers on that date, ultimately to be disappointed.

However, it didn't stop him from making another prediction in 2011 that failed again. His excuse for the failed 1994 prediction was a miscalculation.

He claimed there was a very high chance that the world would end in September, 1994, although he did acknowledge there is possibility that I could be wrong.However, he said he was absolutely sure of the end of the world in 2011. Camping also claimed that around 200 million people (approximately 3% of the world's population) would be raptured.

Now that his prediction has clearly failed, it would be interesting to see whether Camping will admit the failure, come up with another date or better excuses than he did in 1994.