April Fools’ Day 2027 falls on Thursday, April 1, 2027. It is not a federal holiday and closes nothing.
The origin of the custom is unknown, and the explanation almost every article gives does not survive a look at the dates.
The standard story says France’s 1582 switch to the Gregorian calendar moved New Year’s Day from April 1 to January 1, and people who kept celebrating in spring were mocked as April fools.
The problem is that the earliest clear reference to the custom is a 1561 Flemish poem — twenty-one years before the calendar change it supposedly caused.
Table of Contents
When is April Fools’ Day 2027?
Thursday, April 1, 2027. The date is fixed and never moves.
| Detail | Value |
|---|---|
| Date | Thursday, April 1, 2027 |
| Rule | Fixed date, April 1 |
| Federal holiday | No |
| Day of year | 91 of 365 |
| Also called | All Fools’ Day; poisson d’avril in France |
Why the calendar explanation does not work
Laid out chronologically, the standard account collapses.
| Year | Event | Source |
|---|---|---|
| 1392 | Chaucer’s “Nun’s Priest’s Tale” — a disputed possible reference | Wikipedia |
| 1508 | Eloy d’Amerval uses the phrase poisson d’avril — but probably not meaning an April fool. See below | Museum of Hoaxes |
| 1561 | Eduard De Dene’s Flemish poem — a servant realises he is being sent on fool’s errands because it is April 1. The first clear reference | Library of Congress, Folklife Today |
| 1564 | Charles IX moves the French new year from March 25 to January 1 | SAGE, Encyclopedia of Deception |
| 1582 | France adopts the Gregorian calendar | National Geographic |
| 1686 | John Aubrey records “Fooles holy day” — first British reference | Museum of Hoaxes |
| 1708 | A correspondent asks the British Apollo where the custom came from | Museum of Hoaxes |
The 1561 reference predates both the 1564 edict and the 1582 adoption.
A custom already being written about in 1561 cannot have been caused by either.
De Dene’s poem is titled Refereyn vp verzendekens dach / Twelck den eersten April te zyne plach — late medieval Dutch for “Refrain on errand-day, which is the first of April.”
A nobleman sends his servant back and forth on absurd errands, supposedly preparing for a wedding feast, and the servant works out what is happening.
The closing line of each stanza has him say he is afraid he is being made to run a fool’s errand (Museum of Hoaxes; Library of Congress).
The poem does not describe a novelty. It describes something the servant recognises, which means the custom was already established in the Low Countries by then.
Verzendekens dach survives in modern Dutch as verzenderkensdag, still used for the day more than 450 years later.
The popular telling also conflates two separate events. Charles IX moved the French new year to January 1 by edict in 1564; the Gregorian calendar arrived eighteen years later.
Articles that merge them into a single 1582 event are describing something that did not happen that way.
The 1508 reference probably is not one
Most timelines list Eloy d’Amerval’s 1508 use of poisson d’avril as early evidence of the custom in France. The Museum of Hoaxes argues it is not.
D’Amerval does not use the phrase in connection with folly or with April 1. For him it appears to be slang for a pimp or a matchmaker, and etymologists suggest that was the term’s original meaning — it only came to mean “April fool” in the seventeenth century (Museum of Hoaxes).
If that reading is right, the 1508 entry that appears on nearly every April Fools’ timeline is a false positive, and 1561 stands alone as the first clear reference.
One source dates the De Dene poem to 1539
The Library of Congress, the Museum of Hoaxes and most news coverage give 1561.
The SAGE Encyclopedia of Deception gives 1539 for the same poem and the same content — an aristocrat sending servants on fool’s errands on April 1 (SAGE).
The discrepancy does not affect the argument. Both dates precede the 1564 edict and the 1582 calendar adoption, so the calendar theory fails either way.
But a reference work disagreeing with the Library of Congress by twenty-two years is worth stating rather than smoothing over.
Folklorists are direct about this. There is little historical evidence for the calendar theory and many scholars treat it as folklore rather than fact (LiveNOW from FOX).
The Chaucer reference is probably a scribal error
The 1392 “Nun’s Priest’s Tale” is often cited as the earliest reference. A fox tricks the cock Chauntecleer “Syn March bigan thritty dayes and two” — thirty-two days from the start of March, which is April 1.
Two problems (Wikipedia; hoaxes.org):
- The same passage places the story when the sun had run twenty-one degrees in Taurus, which is not April 1.
- Modern scholars believe the manuscripts contain a copying error and that Chaucer wrote “Syn March was gon” — thirty-two days after March ended, which is early May. The SAGE Encyclopedia of Deception puts the intended setting at May 2, the anniversary of Richard II’s engagement to Anne of Bohemia (SAGE).
The historian Peter Travis has argued something more interesting still: that Chaucer was not giving a date at all, but deliberately using confusing language to parody the way medieval philosophy talked about time. On that reading the passage is a joke about precision, not a record of a custom.
The real puzzle
The genuine historical question is not which theory is right but why the record is so thin. Detailed references to April Fools’ Day only start appearing in the eighteenth century — and by then the custom was already well established across northern Europe and regarded as ancient (hoaxes.org).
A tradition that spread across many European cultures without leaving more of a written trail is a harder thing to explain than any single origin story.
The Roman festival of Hilaria, held around the spring equinox in honour of Cybele and involving disguises, is sometimes offered as an ancestor (LiveNOW from FOX). No line of descent has been demonstrated.
April Fools’ Day 2027 closures
| Institution | Thursday, April 1, 2027 |
|---|---|
| Federal offices | Open |
| Banks and Federal Reserve | Open |
| U.S. Postal Service | Normal delivery |
| NYSE and Nasdaq | Open, normal trading |
| State offices | Open in every state |
| Public schools | Open |
Nothing closes for April Fools’ Day anywhere.
April Fools’ Day dates 2025 to 2032
| Year | April 1 falls on |
|---|---|
| 2025 | Tuesday |
| 2026 | Wednesday |
| 2027 | Thursday |
| 2028 | Saturday |
| 2029 | Sunday |
| 2030 | Monday |
| 2031 | Tuesday |
| 2032 | Thursday |
A fixed-date observance advances one weekday per year and two across a leap year, which is why 2027 to 2028 skips Friday.
What April Fools’ Day 2027 is not
It is not a federal holiday, a state holiday, or an observance with any official designation.
Its origin is not known. The 1582 calendar-change story is the most repeated explanation and the evidence does not support it.
It did not originate with Chaucer. The 1392 passage is disputed and most editors read it as referring to early May.
It is not the same custom everywhere. In France and Italy it is poisson d’avril, with paper fish attached to backs; in Scotland it was historically a two-day observance; in Spanish-speaking countries the equivalent prank day is DÃa de los Santos Inocentes on December 28.
In some countries the convention holds that pranks must stop at noon. That rule is not universal and has no American equivalent.
Frequently asked questions
What day is April Fools’ Day 2027?
Thursday, April 1, 2027. The date is fixed to April 1 in every year and never moves. It is not a federal holiday and nothing closes for it.
Why is April 1 April Fools’ Day?
Nobody knows. The most repeated explanation — that France’s 1582 calendar change left people celebrating the new year in spring, who were then mocked — does not fit the dates. The first clear reference to the custom is a Flemish poem from 1561, which predates both the 1564 Edict of Roussillon and the 1582 Gregorian adoption.
Was April Fools’ Day invented by Constantine?
No. That story is itself a hoax. A widely circulated account crediting Emperor Constantine with creating the day originated as a prank and has no historical basis (LiveNOW from FOX).
Sources
- Wikipedia, April Fools’ Day — https://en.wikipedia.org/wiki/April_Fools%27_Day
- National Geographic, How did April Fools’ Day begin? — https://www.nationalgeographic.com/history/article/april-fools-day-origins
- Library of Congress, Folklife Today, April Fools: The Roots of an International Tradition — https://blogs.loc.gov/folklife/2016/03/april-fools/
- Museum of Hoaxes, Eduard de Dene (1561) — https://hoaxes.org/af_database/permalink/eduard_de_dene
- Museum of Hoaxes, April Fool’s Day in the 1500s — https://hoaxes.org/af_database/year/category/1500aprilfools/
- SAGE, Encyclopedia of Deception, April Fool’s Day — https://sk.sagepub.com/ency/edvol/embed/encyclopedia-of-deception/chpt/april-fools-day
- CBS News, citing the Library of Congress — https://www.cbsnews.com/news/how-did-april-fools-day-start/
- Museum of Hoaxes, The Origin of April Fool’s Day — https://hoaxes.org/af_database/permalink/origin_of_april_fools_day
- LiveNOW from FOX, The confusing history of April 1 — https://www.livenowfox.com/news/april-fools-day-origins-history
