The cult leaders had told their followers that the world was going to end on December 31, 1999. However, when their prophecy did not come true, they decided to take matters into their own hands. The cult leaders announced the next day of the apocalypse to be March 17, 2000. They said that the apocalypse would come with "ceremony and finality".
These doomsday cults thrive on the belief that people are living in the end times, that is the world will end soon and only those who follow their prescribed rituals and traditions will be able to meet God.