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Finland and USSR adopt New Style (Gregorian) calendar

The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it...

The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar. The principal change was to space leap years slightly differently to make the average calendar year 365.2425 days long rather than the Julian calendar's 365.25 days, thus more closely approximating the 365.2422-day "tropical" or "solar" year that is determined by the Earth's revolution around the Sun.

The rule for leap years is that every year divisible by four is a leap year, except for years that are divisible by 100, except in turn for years also divisible by 400.

Historical Significance

The Gregorian calendar is the calendar used in most parts of the world.

Events Before

  1. Sculptor Auguste Rodin (76) weds Rose Beuret

    Sculptor Auguste Rodin (76) weds Rose Beuret

  2. First major strike of the Russian "February Revolution" starts at the giant Putilov factory in Petrograd [NS=Mar 3]

    First major strike of the Russian "February Revolution" starts at the giant Putilov factory in Petrograd [NS=Mar 3]

  3. First jazz records are recorded: "Dixie Jazz Band One Step" and "Livery Stable Blues" by the Original Dixieland Jass Ban

    First jazz records are recorded: "Dixie Jazz Band One Step" and "Livery Stable Blues" by the Original Dixieland Jass Band for the Victor Talking Machine Company in NYC

  4. First major strike of the Russian "February Revolution" starts at the giant Putilov factory in Petrograd [OS=Feb 18]

    First major strike of the Russian "February Revolution" starts at the giant Putilov factory in Petrograd [OS=Feb 18]

  5. First jazz record is released on a 78 by the Original Dixieland Jass Band for the Victor Talking Machine Company ("Dixie

    First jazz record is released on a 78 by the Original Dixieland Jass Band for the Victor Talking Machine Company ("Dixie Jazz Band One Step" on one side, "Livery Stable Blues" on the other)

Events After

  1. Battle of Jutland: British naval commander David Beatty is promoted to full admiral

    The Battle of Jutland (German: Skagerrakschlacht, lit. 'Battle of the Skagerrak') was a naval battle between Britain's Royal Navy Grand Fleet, under Admiral Sir John Jellicoe, and the Imperial German...

  2. J. D. Salinger is born

    J. D. Salinger, American author, known for american author, was born on 1919-01-01.

  3. German Workers' Party forms, precursor to the National Socialist German Workers' Party (Nazi)

    The German Workers' Party (German: Deutsche Arbeiterpartei, DAP) was an obscure far-right political party established in the Weimar Republic after World War I.

  4. The 18th Amendment to the US Constitution, authorizing the prohibition of alcohol, is ratified by a majority of US state

    The 18th Amendment to the US Constitution, authorizing the prohibition of alcohol, is ratified by a majority of US states

  5. German theoretical physicist Physicist Albert Einstein (39) divorces Serbian physicist and mathematician Mileva Marić (4

    German theoretical physicist Physicist Albert Einstein (39) divorces Serbian physicist and mathematician Mileva Marić (43) after 16 years of marriage

More from the 1910s

birth

Hank Greenberg is born

Hank Greenberg, American athlete, known for american baseball player, was born on 1911-01-01.

Belgian mining law introduces a 9.5-hour workday

Belgian mining law introduces a 9.5-hour workday

First running of San Francisco's famed "Bay to Breakers" footrace (7.63 miles/12.3 km); Robert Vlught wins in 44:10

First running of San Francisco's famed "Bay to Breakers" footrace (7.63 miles/12.3 km); Robert Vlught wins in 44:10

The US Post Office begins parcel post delivery

The Bronx General Post Office (also known as the Bronx Central Post Office or Bronx Central Annex) is a historic post office building at 558 Grand Concourse in the South Bronx in New York City, New…

Frequently Asked Questions

What happened on January 14, 1918?
The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar. The principal change was to space leap years slightly differently to make the average calendar year 365.2425 days long rather than the Julian calendar's 365.25 days, thus more closely approximating the 365.2422-day "tropical" or "solar" year that is determined by the Earth's revolution around the Sun.
Why is Finland and USSR adopt New Style (Gregorian) calendar significant?
The Gregorian calendar is the calendar used in most parts of the world.

Explore More

January 14 in HistoryYear 1918