The end is nigh, insists Robert Fitzpatrick.

And he’s put his money where his mouth is. If the world doesn’t end on May 21, one week from tomorrow, he’ll have wasted more than $140,000 on bus and subway advertising.

The 60-year-old Staten Island resident, a retired MTA employee, says he’s spent at least that sum — his life savings — on 1,000 subway-car placards, and even more ads on bus kiosks and subway cars. They say: “Global Earthquake: The Greatest Ever! Judgment Day May 21, 2011.”

In a self-published book, “The Doomsday Code,” Fitzpatrick says the Bible offers “proof that cannot be dismissed.”

“Judgment Day will surprise people. We will not be ready for it,” Fitzpatrick said in an interview with The Post yesterday.

“A giant earthquake will render the earth uninhabitable,” he added.

If you want to set an alarm clock, the quake will happen just before 6 p.m., he said.

“God’s people will be resurrected. It is also the day that God stops saving anyone,” he said.

Fitzpatrick hopes he’s one of the chosen ones, but he can’t be really certain.

“There’s just a little doubt,” he said. “Most churches teach that if you just believe, you will be saved. It is not our choice. It is God’s choice.”

Fitzpatrick’s book is based on the teachings of Harold Camping, an 89-year-old radio host with a poor track record of end-of-the-world prophecies.

Camping also predicted the world would end on Sept. 6, 1994.

When the sun rose per normal the next day, Camping went back to his Bible and tried to figure out why he was wrong.

Camping’s group, familyradio.com, is buying billboards nationwide spreading his prophecy.

Many say the whole thing is a colossal scam.

But Fitzpatrick, an engineer who held down a desk job at the MTA for 26 years, says he doesn’t want to consider the idea that Camping might be wrong.

“I don’t want to talk about it. I don’t want to think about it,” he said.

“Everybody asks me that.”

bill.sanderson@nypost.com

