From Glenn Greenwald:

This is how apocalyptic cult leaders always function. When the end of the world did not materialize on January 6, Collins insisted that January 20 was the day of the violent reckoning. When nothing happened on that day, he moved the Doomsday Date to March 4. The flock cannot remain in a state of confusion for too long about why the world has not ended as promised by the prophet, so a new date must quickly be provided with an explanation for why this is serious business this time.