Why France Used Paris Mean Time Until 1911
When the world agreed on Greenwich as the prime meridian in 1884, most nations fell in line. France did not. For 27 years, the country stubbornly clung to its own Paris Mean Time, refusing to subordinate the City of Light to London.
It was not a scientific objection. It was a matter of national pride.
This guide explains why France resisted Greenwich, how it finally gave in, and why the French never actually admitted defeat.
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The Short Answer: Why France Resisted
France used Paris Mean Time until 1911 because adopting Greenwich was seen as a national humiliation. The Paris Meridian was a symbol of French scientific prestige, and politicians refused to cede that honor to the British.
| Aspect | Details |
|---|---|
| Paris Mean Time offset | UTC+00:09:21 |
| Difference from GMT | 9 minutes 21 seconds |
| Resistance period | 1884–1911 (27 years) |
| Key figure | Pierre Janssen |
| Official reason | Paris Meridian was "better" |
| Real reason | National pride |
| Final law | March 9, 1911 |
| Change occurred | Night of March 10–11, 1911 |
The Paris Meridian: A Symbol of French Glory
The Royal Legacy
The Paris Meridian was not just a line on a map. It was a monument to French scientific achievement, established by the Sun King himself.
| Aspect | Details |
|---|---|
| Established | 1667 |
| King | Louis XIV |
| Location | Paris Observatory |
| Legacy | Symbol of French science |
Louis XIV, the "Roi Soleil," personally laid a white marble strip marking the meridian zero of the Paris Observatory [citation:1]. Since then, the French had always been reluctant to abandon this "visible sign of the ancient glory of La France" [citation:1].
The Scientific Case
French astronomers genuinely believed the Paris Meridian was superior. The debate was not entirely irrational — both meridians were scientifically valid choices.
| Argument | French Position |
|---|---|
| Neutrality | No nation should own the prime meridian |
| Metric system | Should be the basis of standards |
| Paris prestige | A world-class observatory |
Pierre Janssen: The Defiant Astronomer
Pierre Janssen was the director of the Paris Observatory and the leader of French resistance. He refused to abide by the conference's "slicing" of the Earth and fought Greenwich until the end [citation:1].
| Aspect | Details |
|---|---|
| Role | Director, Paris Observatory |
| Position | Against Greenwich |
| Alternative | Neutral meridian (Bering Strait) |
| Legacy | Symbol of French resistance |
The 1884 Conference: France's Isolation
The Vote
At the International Meridian Conference in Washington, D.C., the vote was overwhelmingly in favor of Greenwich. France abstained rather than accept defeat.
| Aspect | Details |
|---|---|
| Vote | 22 for Greenwich, 1 against, 2 abstained |
| France | Abstained |
| Brazil | Abstained |
| San Domingo | Voted against |
The Neutral Meridian Proposal
During the conference, Janssen made a desperate proposal: a neutral meridian passing through the Bering Strait, belonging to no nation [citation:4].
| Proposal | Details |
|---|---|
| Meridian | Bering Strait |
| Reason | Belongs to no nation |
| Result | Rejected |
The French Reaction
The French press was defiant. Le Gaulois summed up the national mood: "Ni Allemands ni Anglais, Français!" — Neither Germans nor English, French! [citation:4]
The 27-Year Resistance: Paris Mean Time in Practice
What Paris Mean Time Was
Paris Mean Time was 9 minutes and 21 seconds ahead of GMT [citation:2][citation:5].
| Aspect | Details |
|---|---|
| Paris Mean Time | UTC+00:09:21 |
| Greenwich Mean Time | UTC+00:00:00 |
| Difference | 9 minutes 21 seconds |
The Unspoken Compromise
Even while officially using Paris Mean Time, France was gradually moving toward international standards. The Bureau des Longitudes published the difference between the two meridians, making conversion easy [citation:5].
| Aspect | Details |
|---|---|
| Bureau des Longitudes | Published conversion |
| Difference | 9 minutes 20.9 seconds |
| Effect | Practical alignment |
The Railway Pressure
French railways needed to coordinate with neighboring countries. The practical pressure to adopt Greenwich grew year by year.
| Pressure | Source |
|---|---|
| International trains | Cross-border schedules |
| Telegraph | Global communication |
| Navigation | Maritime coordination |
The 1911 Law: How France Gave In Without Admitting It
The Law of March 9, 1911
The French Parliament passed a law on March 9, 1911, adopting Greenwich Mean Time as the legal time — but the law never mentioned Greenwich [citation:13].
| Aspect | Details |
|---|---|
| Law date | March 9, 1911 |
| Change | Adopt GMT |
| Word "Greenwich" | Never used |
| Clever wording | "Paris Mean Time minus 9:21" |
The Wording Trick
Instead of saying "Greenwich Mean Time," the law stated that French legal time was "the mean time of Paris retarded by 9 minutes and 20.9 seconds" [citation:2][citation:5].
| Wording | Meaning |
|---|---|
| Official text | "Paris Mean Time retarded by 9:21" |
| Practical result | Greenwich Mean Time |
| National pride | Preserved |
This was a masterful compromise: France adopted Greenwich time without ever admitting it.
The Change Itself
On the night of March 10–11, 1911, all official clocks in France were stopped and restarted 9 minutes and 21 seconds later [citation:4][citation:13].
| Aspect | Details |
|---|---|
| Date | Night of March 10–11, 1911 |
| Action | Clocks set back 9:21 |
| Result | Alignment with GMT |
| Public reaction | Mixed, some amused |
The New York Times reported that "considerable fun has been had in Paris" over the change [citation:6].
The Saumur Solution
Some suggested calling the new time "Saumur time" after the town on the exact Greenwich meridian, rather than "London time" [citation:1].
| Aspect | Details |
|---|---|
| Alternative name | Saumur time |
| Reason | Avoid saying "London" |
| Location | Saumur on Greenwich meridian |
The Aftermath: France's Slow Acceptance
The Observatory Delay
The Paris Observatory did not fully switch to Greenwich time until July 1, 1911 — nearly four months after the law passed [citation:7][citation:20].
| Aspect | Details |
|---|---|
| Law passed | March 9, 1911 |
| Observatory switched | July 1, 1911 |
| Reason | Technical transition |
The Bureau International de l'Heure
France turned its defeat into a diplomatic victory. In 1912, Paris hosted the International Time Conference, and the Bureau International de l'Heure was established in Paris [citation:8][citation:17].
| Aspect | Details |
|---|---|
| Conference | Paris, 1912 |
| Result | Bureau International de l'Heure |
| Location | Paris |
| Legacy | France kept time leadership |
Quick Reference Card
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WHY FRANCE USED PARIS MEAN TIME — CHEAT SHEET
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PARIS MEAN TIME:
Offset: UTC+00:09:21
Difference from GMT: 9 minutes 21 seconds
Used until: March 11, 1911
WHY FRANCE RESISTED:
• National pride
• Paris Meridian as symbol of glory
• Louis XIV established it personally
• Wanted a neutral meridian (Bering Strait)
• Objected to "British" Greenwich
KEY FIGURE:
Pierre Janssen — Director, Paris Observatory
Refused to accept Greenwich until the end
THE 1884 CONFERENCE:
France abstained from the vote
Proposed Bering Strait neutral meridian
Rejected by other nations
THE 1911 LAW:
Date: March 9, 1911
Wording: Never mentioned "Greenwich"
Official text: "Paris Mean Time minus 9:21"
Change: Night of March 10–11, 1911
THE CLEVER COMPROMISE:
France adopted Greenwich time
Without admitting it
National pride preserved
AFTERMATH:
Observatory switched July 1, 1911
Paris hosted 1912 Time Conference
Bureau International de l'Heure in Paris
GOLDEN RULE:
France gave in to Greenwich, but never said so.
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Check live conversions at: /timezone-converter
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Frequently Asked Questions
Why did France use Paris Mean Time until 1911?
France resisted Greenwich Mean Time out of national pride. The Paris Meridian was a symbol of French scientific glory, and adopting Greenwich was seen as subordinating Paris to London.
What was the difference between Paris Mean Time and GMT?
Paris Mean Time was 9 minutes and 21 seconds ahead of Greenwich Mean Time [citation:2][citation:5].
Who led the French resistance to Greenwich?
Pierre Janssen, director of the Paris Observatory, was the leading opponent of Greenwich. He refused to accept the conference's decision and proposed a neutral meridian instead [citation:1][citation:4].
What happened at the 1884 International Meridian Conference?
Greenwich was chosen as the prime meridian by a vote of 22 to 1. France abstained rather than accept defeat [citation:13].
When did France finally adopt Greenwich Mean Time?
France adopted Greenwich Mean Time with the law of March 9, 1911. The actual change occurred on the night of March 10–11, 1911 [citation:13].
Did the 1911 law mention Greenwich?
No. The law never mentioned Greenwich. It stated that French legal time was "the mean time of Paris retarded by 9 minutes and 20.9 seconds" [citation:2][citation:5].
Why did the law avoid mentioning Greenwich?
To preserve national pride. France adopted Greenwich time without admitting it, avoiding the humiliation of explicitly subordinating Paris to London [citation:2].
What was "Saumur time"?
Some suggested calling the new time "Saumur time" after the town on the exact Greenwich meridian, rather than "London time" [citation:1].
When did the Paris Observatory switch to Greenwich time?
The Paris Observatory continued broadcasting Paris Mean Time until July 1, 1911, nearly four months after the law passed [citation:7][citation:20].
Did France gain anything from the change?
Yes. France turned its defeat into a diplomatic victory by hosting the 1912 International Time Conference and establishing the Bureau International de l'Heure in Paris [citation:8][citation:17].
Final Thoughts
France's 27-year resistance to Greenwich Mean Time was one of the longest and most stubborn holdouts in the history of timekeeping. It was not about science — it was about honor. The Paris Meridian was a monument to French greatness, and giving it up meant admitting that London had won.
In the end, France gave in — but on its own terms. The law of 1911 adopted Greenwich time without ever saying the word. The clocks changed, but the pride remained intact.
Three things to remember:
- France resisted for 27 years. National pride, not science
- The 1911 law never mentioned Greenwich. A masterful compromise
- France turned defeat into victory. Paris hosted the 1912 Time Conference
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Tags: why France used Paris Mean Time until 1911, France Greenwich Mean Time resistance, Paris Meridian history, France time zone history, 1911 French time law, International Meridian Conference France, Paris Observatory meridian, France adopts GMT, French time zone change, time zone converter
