OAKLAND, Calif. – California preacher Harold Camping said Monday his prophecy that the world would end was off by five months because Judgment Day actually will come on Oct. 21.

Camping, who predicted that 200 million Christians would be taken to heaven Saturday before the Earth was destroyed, said he felt so terrible when his doomsday prediction did not come true that he left home and took refuge in a motel with his wife. His independent ministry, Family Radio International, spent millions — some of it from donations made by followers — on more than 5,000 billboards and 20 RVs plastered with the Judgment Day message.

But Camping said that he’s now realized the apocalypse will come five months after May 21, the original date he predicted. He had earlier said Oct. 21 was when the globe would be consumed by a fireball.

It’s not the first time the independent Christian radio host has been forced to explain when his prediction didn’t come to pass. He also predicted the Apocalypse would come in 1994, but said it didn’t happen then because of a mathematical error.

Rather than give his normal daily broadcast Monday, Camping made a special statement before the press at the Oakland headquarters of the media empire that has broadcast his message. His show, “Open Forum,” has for months headlined his doomsday message via the group’s radio stations, TV channels, satellite broadcasts and website.

Apocalyptic thinking has always been part of American religious life and popular culture. Teachings about the end of the world vary dramatically about how it will occur.

Still, the overwhelming majority of Christians reject the idea that the exact date or time of Jesus’ return can be predicted.

Tim LaHaye, co-author of the best-selling “Left Behind” novels about the end times, recently called Camping’s prediction “not only bizarre but 100 percent wrong!” He cited the bible verse Matthew 24:36, “but about that day or hour no one knows” except God.

“While it may be in the near future, many signs of our times certainly indicate so, but anyone who thinks they ‘know’ the day and the hour is flat out wrong,” LaHaye wrote on his website, leftbehind.com.

In 2009, the nonprofit Family Radio reported in IRS filings that it received $18.3 million in donations, and had assets of more than $104 million, including $34 million in stocks or other publicly traded securities.