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End of the World

A lighthearted observance on May 21 reflecting on humanity's long history of failed apocalypse predictions and the cultural fascination with doomsday scenarios.

Friday

May 2027

Last updated March 19, 2026 · by the Holiday Calendar Team

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YEARLY DATEMay 21

OBSERVED INInternationally

CATEGORYFun

SUBCATEGORYParanormal

ORIGIN

Community Origin

FOUNDING ENTITY

Not documented

FIRST OBSERVED

~2011

HOW THE HOLIDAY CAME TO BE

No formal founder or establishment record exists. The May 21 date gained cultural attention after Harold Camping's widely publicized failed Rapture prediction in 2011, and has since circulated as an informal, tongue-in-cheek observance.

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INTRO

Introduction

PHOTO

Humanity has predicted its own extinction hundreds of times, and has been wrong every single time. End of the World Day falls on May 21, the date that radio evangelist Harold Camping told millions of listeners the Rapture would arrive in 2011, backed by $100 million in advertising and roughly 1,200 billboards across the United States.

The day has since taken on an ironic second life as a reminder that apocalypse predictions are as old as civilization itself, dating to a Mesopotamian clay tablet from nearly 5,000 years ago. Rather than stoking anxiety, the observance invites a look at the psychology, history, and recurring pattern of doomsday forecasts that never delivered.

ORIGINS

End of the World history

INTRODUCTION

Predicting the end of the world is one of the oldest recorded human activities. The earliest known example is an Assyrian clay tablet, dated to roughly 2800 BCE, in which the author lamented that the earth had degenerated to a point where destruction was imminent. That tablet was wrong, but the impulse it captured has repeated itself across every major civilization since.

In medieval and early modern Europe, apocalyptic dates picked up speed. Pope Innocent III calculated that the world would end 666 years after the rise of Islam, placing his forecast around 1284. In 1524, a group of English astrologers predicted a great flood, reportedly causing 20,000 Londoners to flee to higher ground.

CHAPTER 01

The Great Disappointment and Its Afterlife

The most consequential failed prophecy in American history came from William Miller, a Baptist preacher who used biblical arithmetic to predict Christ's return by October 22, 1844. An estimated 50,000 to 100,000 followers prepared for the event, with many giving away their possessions. When the date passed without incident, the fallout became known as the Great Disappointment.

Rather than extinguishing the movement, the failure reshaped it. Former Millerites reinterpreted the prophecy and eventually organized into the Seventh-day Adventist Church, which was formally established in 1863 and today has over 21 million members worldwide.

CHAPTER 02

Harold Camping and the Birth of May 21

The date that now anchors the observance comes from Harold Camping, president of the Family Radio network based in Oakland, California. Camping had previously predicted the Rapture for September 1994, which passed without event. Undeterred, he recalculated and announced May 21, 2011, as Judgment Day, deploying roughly 1,200 billboards and broadcasting the message in 84 languages.

Family Radio spent over $100 million on the campaign. When May 21 arrived and no Rapture occurred, Camping said he was "flabbergasted" before revising his prediction to October 21 of the same year. That date also passed quietly. Camping later acknowledged his error, and he died in 2013. The date, however, gained a second life as an ironic, informal observance celebrating humanity's unbroken streak of surviving its own predictions.

TIMELINE

End of the World Timeline

Earliest known doomsday text

An Assyrian clay tablet, dating to roughly 2800 BCE, declared that the earth was degenerating and that signs pointed to imminent destruction.

The Great Disappointment

Baptist preacher William Miller predicted Christ's return by October 22, 1844, attracting up to 100,000 followers who were left devastated when the date passed uneventfully.

Halley's Comet panic

Astronomers detected cyanogen gas in the comet's tail, triggering widespread fear that Earth's passage through the tail would poison the atmosphere.

Camping predicts May 21 Rapture

Harold Camping's Family Radio network spent over $100 million promoting May 21 as Judgment Day, broadcasting the message in 84 languages worldwide.

Mayan calendar misinterpretation

A global doomsday scare centered on December 21 was debunked by NASA and Mayan scholars, who clarified the Long Count calendar was simply cycling to a new period.

GET INVOLVED

How to Celebrate End of the World

Read the Bulletin of the Atomic Scientists

Visit the Doomsday Clock page to explore how scientists assess genuine existential threats to human civilization. The timeline of clock adjustments since 1947 offers a fact-based counterpart to the day's theme of unfounded predictions.

WATCH

Watch a documentary on apocalyptic movements

Films like Apocalypse Not and episodes of PBS Frontline have examined why doomsday groups form and how followers cope after failed predictions. Streaming one while discussing the psychology of belief makes for an engaging group viewing event.

HOST

Host a "we survived" dinner party

Pick a theme from history's failed predictions and throw a celebration of continued existence. Assign each guest a different doomsday prophecy to present, turning the evening into an informal crash course in the history of apocalypticism.

EXPLORE

Explore the history of existential risk research

Browse the Centre for the Study of Existential Risk at the University of Cambridge to learn how researchers distinguish science-based global risks from speculative doomsday claims. The centre's publications cover AI safety, pandemics, and climate tipping points.

VISIT

Visit a natural history museum

Institutions like the American Museum of Natural History house evidence of the five real mass extinctions Earth has experienced. Walking through geological timescales puts both ancient fears and modern risk assessments into tangible perspective.

WHY THIS DAY MATTERS

Why We Love End of the World

Failed prophecies have reshaped institutions

The Great Disappointment of 1844 did not end apocalyptic Christianity; it spawned the Seventh-day Adventist Church, now a global denomination with over 21 million members. Harold Camping's campaign similarly prompted public debate about media literacy, financial exploitation, and the legal boundaries of prophetic speech.

Apocalypticism is a persistent cognitive pattern

Psychologists have documented that doomsday beliefs reduce complex, diffuse threats to a single, comprehensible event, which can feel paradoxically reassuring. Understanding this pattern helps explain why failed predictions rarely discourage new ones.

Real existential risks benefit from scrutiny

The Bulletin of the Atomic Scientists set the Doomsday Clock at 90 seconds to midnight in 2024, its closest point to that date, citing nuclear proliferation, climate change, and AI-related risks. Distinguishing evidence-based threat assessment from unfounded prophecy is a practical skill the observance implicitly encourages.

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