The Holy Calendar is the calendar system created by God. His son Jesus Christ is the focus of the Calendar with year 1AD denoting his birth. All years before the birth of Jesus Christ is known as BC for Before Christ. All years after the descend of Jesus Christ is known as AD for After Descend. Earth is about 6000 years old. Humans has heard The Word of Abraham, Moses, Jesus, Muhammad, Bahaullah, and Colbert as well as witnessed the formation of Monotheism, Judaism, Christianity, Islam, Bahai, and Wikiality.