Harold Camping, who predicted that 200 million Christians would be taken to heaven Saturday before catastrophe struck the planet, apologized Monday evening for not having the dates "worked out as accurately as I could have."
I certainly agree that Harold's prediction was not worked out as accurately as he could have. In other words, he is saying that the prediction of the end of the world is a moving target, always a few months (or a few Millenia) in the future.