Predictions and prophesies about Dec 21, 2012

People around the world are worried and concerned about predictions and prophesies about coming 21st of December 2012.
This time is given many names such as:
"The Time of Trial on Earth,"
"Judgement Day,"
"The Time of Great Purification,"
"The End of this Creation,"
"The Quickening,"
"The End of Time as We Know It,"
"The Shift of the Ages,"
"The Apocalypse"
and "Armageddon".