About September 17

September 17, 2025 is the 260th day of the year 2025 in the Gregorian calendar. There are 105 days remaining until the end of this year. The day of the week is Wednesday.

You can browse the full year calendar in case you need it.

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Virgo is the sun sign of a person born on this day. Sapphire is the modern birthstone for this month. Agate is the mystical birthstone from Tibetan origin that dates back over a thousand years.

According to the lunisolar Chinese calendar, there are 153 days remaining before the start of the next Chinese New Year.

What Happened On September 17

  • 1111 –
    Highest Galician nobility led by Pedro Fróilaz de Traba and the bishop Diego Gelmírez crown Alfonso VII as “King of Galicia”.
  • 1462 –
    The Battle of Świecino (also known as the Battle of Żarnowiec) is fought during Thirteen Years’ War.
  • 1577 –
    The Peace of Bergerac is signed between Henry III of France and the Huguenots.
  • 1630 –
    The city of Boston, Massachusetts is founded.
  • 1775 –
    American Revolutionary War: The Invasion of Canada begins with the Siege of Fort St. Jean.
  • 1787 –
    The United States Constitution is signed in Philadelphia, Pennsylvania.
  • 1809 –
    Peace between Sweden and Russia in the Finnish War. The territory to become Finland is ceded to Russia by the Treaty of Fredrikshamn.
  • 1894 –
    The Battle of Yalu River, the largest naval engagement of the First Sino-Japanese War.
  • 1900 –
    Philippine-American War: Filipinos under Juan Cailles defeat Americans under Colonel Benjamin F. Cheatham at Mabitac.
  • 1928 –
    The Okeechobee Hurricane strikes southeastern Florida, killing upwards of 2,500 people. It is the third deadliest natural disaster in United States history, behind the Galveston Hurricane of 1900 and the 1906 San Francisco earthquake.
  • 1941 –
    World War II: A decree of the Soviet State Committee of Defense, restoring Vsevobuch in the face of the Great Patriotic War, is issued
  • 1948 –
    The Nizam of Hyderabad surrenders his sovereignty over the Hyderabad State and joins the Indian Union.
  • 1961 –
    The world’s first retractable-dome stadium, the Civic Arena, opens in Pittsburgh.
  • 1978 –
    The Camp David Accords are signed by Israel and Egypt.
  • 1980 –
    After weeks of strikes at the Lenin Shipyard in Gdańsk, Poland, the nationwide independent trade union Solidarity is established.
  • 1983 –
    Vanessa Williams becomes the first black Miss America.
  • 1991 –
    The first version of the Linux kernel (0.01) is released to the Internet.
  • 1992 –
    An Iranian Kurdish leader and his two joiners are assassinated by political militants in Berlin, Germany.
  • 2001 –
    The New York Stock Exchange reopens for trading after the September 11 Attacks, the longest closure since the Great Depression.
  • 2006 –
    An audio tape of a private speech by Hungarian Prime Minister Ferenc Gyurcsány is leaked to the public, in which he confessed that his Hungarian Socialist Party had lied to win the 2006 election, sparking widespread protests across the country.

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