I did find something about the cult of Christians on the Internet, but I don't know how large this group is...
According to one website, they believe the rapture will happen between May 11, 2011 and October 11, 2011. That was according to one website -- not what I believe.
I have also heard people talking about 2012 like it is going to be the end of the world...
I don't know what about that, but maybe it comes from Nostradamus and his predictions...
The only thing about datesetting the Rapture is that ANY date given for the Rapture is not Scriptural. Not even Jesus Christ, nor the Adversary knows the day or hour, only the Father.