Holiday Calendar

End of the World

Next celebratedFriday, May 21, 2027

An informal observance on May 21 reflecting on humanity's long record of failed apocalypse predictions and why such forecasts keep recurring.

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Last updated March 19, 2026 · by the Holiday Calendar TeamHave an update or spot an error?
YEARLY DATEMay 21
OBSERVED INInternationally
CATEGORYFun
SUBCATEGORYParanormal
ORIGIN

Community Origin

FOUNDING ENTITY
Not documented
FIRST OBSERVED
~2011
HOW THE HOLIDAY CAME TO BE

A date the world kept after the world didn't end.

No founder, organization, or proclamation established the observance. The May 21 date entered popular culture after radio preacher Harold Camping predicted the Rapture for May 21, 2011, in a campaign reported to cost around $100 million; when the day passed quietly, the date persisted as an informal, tongue-in-cheek marker that the world is still here.

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INTRO

The day the apocalypse stood you up

In the spring of 2011, a retired civil engineer named Harold Camping told the world it had until May 21. His ministry, Family Radio, spent a reported $100 million on the warning, plastering biblical billboards across dozens of countries and broadcasting in scores of languages.

The math was specific. The Rapture would begin at 6 p.m. local time and roll across the planet time zone by time zone. Some followers believed about 200 million people would be lifted away, with earthquakes close behind.

None of it happened. Camping resurfaced days later, by his own account "flabbergasted," already searching for what had gone wrong. What survived the quiet morning was the calendar square: May 21 is now an unofficial End of the World Day, a wry note that humanity has forecast its own extinction for thousands of years and gone right on existing.

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ORIGINS

End of the World history

INTRODUCTION

Predicting the end is one of the oldest things people do, and getting it wrong is one of the most reliable. The forecasts span empires, faiths, and centuries, and every single one has shared a result: the morning after.

The pattern is easy to see once you line the failures up. A confident date, a swell of belief, a quiet dawn, and then a search for what went wrong. The interesting part is rarely the prophecy. It is what people do when the prophecy does not arrive.

CHAPTER 01

A flood, a comet, and a habit of being wrong

In 1524, the German mathematician Johannes Stoffler read the planets and announced a world-ending flood. More than 100 pamphlets backed him. The day arrived nearly drought-dry, and the planet carried on.

Centuries later the fear found new vehicles. When Earth was set to pass through the tail of Halley's Comet in 1910, astronomers detected toxic cyanogen gas in it. Newspapers ran with the threat, and enterprising sellers offered anti-comet pills and gas masks to a jittery public. Earth sailed through untouched.

CHAPTER 02

The Great Disappointment and what grew from it

The most consequential American miss came from William Miller, a Baptist lay preacher who used biblical arithmetic to expect Christ's return by 1844. A follower fixed the day as October 22. Tens of thousands prepared, some giving away their possessions.

When nothing happened, the grief was so sharp it earned a name: the Great Disappointment. Yet the failure did not end the movement. Believers reinterpreted the prophecy, and the group that regrouped became the Seventh-day Adventist Church, now a global denomination of millions. A failed end date had seeded a lasting institution.

CHAPTER 03

How May 21 got its reputation

Harold Camping reached his date by calculation, not vision. A civil engineer by training, he placed the biblical Flood at 4990 BC, applied the line that "a thousand years is as one day," and arrived at 2011. May 21 was his reading of a date buried in Genesis.

When May 21, 2011 passed, he did not concede right away. He called it an "invisible" spiritual judgment and named October 21 instead, the date the physical end would supposedly arrive. That morning was uneventful too.

No one founded an "End of the World Day" on purpose. The date simply stuck, kept alive each year as a quiet joke about a deadline the world keeps missing.

WHY THIS DAY MATTERS

Why End of the World Matters

INSTITUTIONS

A missed apocalypse built a church of millions.

The 1844 Great Disappointment did not end apocalyptic belief; it gave rise to the Seventh-day Adventist Church, now about 23.6 million members worldwide. A wrong date can leave a permanent institution behind.

PSYCHOLOGY

Belief rarely dies on the deadline

When a prediction fails, groups tend to rationalize or recalculate rather than walk away, a response social scientists have studied since the 1950s. Camping's pivot to an 'invisible' judgment was a textbook example.

SCIENCE

It sharpens the line between fear and evidence

The Doomsday Clock, run by atomic scientists since 1947, gauges real human-made risks rather than prophecy. Looking back at predictions that flopped is good practice for telling a measured warning from a baseless one.

TIMELINE

Timeline

A flood that never came

German mathematician Johannes Stoffler predicted a world-ending flood for February 20; more than 100 pamphlets endorsed it, and the day stayed nearly dry.

The Great Disappointment

William Miller's followers expected Christ on October 22; the heartbroken movement that regrouped afterward became the Seventh-day Adventist Church.

Halley's Comet panic

Cyanogen gas detected in the comet's tail sparked fears Earth would be poisoned, and vendors sold anti-comet pills and gas masks.

Camping's May 21 Rapture

Harold Camping's Family Radio campaign named May 21 as Judgment Day, then rescheduled to October 21 before he conceded the attempt was a mistake.

The Maya calendar scare

A global panic pinned doomsday to December 21 until NASA and Maya scholars explained the Long Count was simply starting a new cycle.

Doomsday Clock at 89 seconds

The Bulletin of the Atomic Scientists moved its symbolic clock to 89 seconds to midnight, the closest to that mark in its history.

GOOD TO KNOW

Surprising facts about End of the World

One author disavowed his own doomsday before it arrived

The 1974 book The Jupiter Effect tied catastrophic earthquakes to a 1982 planetary alignment, but one of its own authors publicly walked back the key prediction before the date came.

NASA published 'Why the World Didn't End Yesterday'

Ahead of the 2012 Maya scare, NASA stated plainly that the dreaded planet Nibiru does not exist and that the Long Count calendar simply rolls into a new cycle.

May 21 was a sequel, not a premiere

Camping had already pegged the end to September 1994 in an earlier book, blaming a mathematical error for that miss before trying again in 2011.

He retired weeks after the deadline passed

Camping suffered a stroke on June 9, 2011, less than three weeks after his failed May date, and stepped back from broadcasting soon after.

He eventually called date-setting a sin

By March 2012 Camping wrote to listeners that trying to name the day had been 'sinful,' conceding the critics who quoted 'of that day and hour knoweth no man' were right.

GET INVOLVED

How to Observe End of the World

EDITOR'S PICK

Read up on a famous failed prediction

Pick one doomsday forecast, from the 1524 flood to the 2012 Maya scare, and trace what people actually did before and after. The gap between the panic and the quiet morning after is where the real story lives.

CHECK

Check the Doomsday Clock

Visit the Bulletin of the Atomic Scientists to see how researchers assess genuine global risks. It is a useful counterpoint to predictions built on arithmetic and dread.

COMPARE

Compare how NASA debunked 2012

Read NASA's own explanation of why the Maya calendar scare had no scientific basis. It is a clear model for separating an evidence-based answer from an internet rumor.

DISCUSS

Discuss why predictions keep recurring

Talk through why a failed forecast so rarely ends the belief behind it. The pattern of rationalizing or recalculating is more revealing than any single prophecy.

MARK

Mark the date with a clear conscience

Note the day, then go about your plans as usual. The entire point of the observance is that the deadline came and the world stayed put.

Test your knowledge

How well do you know End of the World?

1 / 8

Whose 2011 prediction is the May 21 date associated with?

Answer

It is marked on May 21, the anniversary of Harold Camping's failed 2011 Rapture prediction. The date is fixed and does not move.

COLOPHON

Sources

How we know what’s on this page. References, not endorsements.

9sources
3primary records
3independently dated
Primary records
NASA Jet Propulsion Laboratory2009-11
2012: A Scientific Reality Check
NASA's own debunking of the 2012 Maya doomsday and the claim that a planet called Nibiru exists.
View source
Bulletin of the Atomic Scientists2025-01-28
2025 Doomsday Clock Statement
The 2025 setting of the Doomsday Clock at 89 seconds to midnight, the closest in its history.
View source
Adventist News (Inter-European Division)2025-05
Adventists grow worldwide to 23.6 million members
Official Seventh-day Adventist membership of 23,684,237 at the end of 2024.
View source
Additional coverage
Wikipedia
2011 end times prediction
Camping's May 21 campaign, the reported $100 million cost, the time-zone rapture claim, and the October reschedule.
View source
Wikipedia
Harold Camping
Camping's engineering background, his 1994 prediction and 'mathematical error,' and his 2012 retraction.
View source
Wikipedia
Great Disappointment
William Miller's 1844 prediction and how the movement that survived became the Seventh-day Adventist Church.
View source
Science History Institute
The Comet Panic of 1910, Revisited
The cyanogen-gas scare during Halley's Comet's 1910 pass and the anti-comet pills sold to a worried public.
View source
Smithsonian Magazine
Ten Notable Apocalypses That (Obviously) Didn't Happen
A survey of failed predictions including Johannes Stoffler's 1524 flood and its many pamphlets.
View source
Wikipedia
Year 2000 problem
The Y2K bug and the estimated $300 to $600 billion spent worldwide on remediation before the rollover.
View source
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