The calendar itself is man-made; what is the sanctity for man-prophesied apocalypse? The day, month, year and the calendar have been made by man, and that too in different categories. Day and night phenomenon exists because of the Sun and Moon. God had never revealed to any prophets about the exact time of the doomsday. There are indications, but there is not a fixed date. Is there a fixed date for the Sun to become a red giant and swallow everything, including the Earth? Scientists have observed that this phenomenon would occur, billions of years from now. All calculations of 666, the number attributed to Satan, are transcending the realm of imagination. God-believers can safely believe in the Apocalypse, but without a pre-known day. Therefore, why should we worry about December 21, 2012 when no one has the information from God Almighty. Atheists can scoff at the very idea of Apocalypse. They would believe the scientific explanation of the Sun turning a red giant billions of years from now.