About August 21

August 21, 2025 is the 233rd day of the year 2025 in the Gregorian calendar. There are 132 days remaining until the end of this year. The day of the week is Thursday.

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

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

According to the lunisolar Chinese calendar, there are 180 days remaining before the start of the next Chinese New Year.

What Happened On August 21

  • 1689
    The Battle of Dunkeld in Scotland.
  • 1772
    King Gustav III completes his coup d'état by adopting a new Constitution, ending half a century of parliamentary rule in Sweden and installing himself as an enlightened despot.
  • 1778
    American Revolutionary War: British forces begin besieging the French outpost at Pondicherry.
  • 1810
    Jean-Baptiste Bernadotte, Marshal of France, is elected Crown Prince of Sweden by the Swedish Riksdag of the Estates.
  • 1852
    Tlingit Indians destroy Fort Selkirk, Yukon Territory.
  • 1863
    Lawrence, Kansas is destroyed by Confederate guerrillas Quantrill’s Raiders in the Lawrence Massacre.
  • 1879
    The Virgin Mary, along with St. Joseph and St. John the Evangelist, reportedly appears at Knock Shrine in Knock, County Mayo, Ireland.
  • 1918
    World War I: The Second Battle of the Somme begins.
  • 1942
    World War II: a Nazi flag is installed atop the Mount Elbrus.
  • 1942
    World War II: the Guadalcanal campaign: American forces defeat an attack by Imperial Japanese Army soldiers in the Battle of the Tenaru.
  • 1944
    Dumbarton Oaks Conference, prelude to the United Nations, begins.
  • 1944
    World War II: Canadian and Polish units capture the strategically important town of Falaise, France.
  • 1961
    Motown releases what would be its first #1 hit, “Please Mr. Postman” by The Marvelettes.
  • 1968
    Soviet Union-dominated Warsaw Pact troops invade Czechoslovakia, crushing the Prague Spring; on the same day, Nicolae Ceauşescu, leader of Communist Romania, publicly condemns the Soviet maneuver, encouraging the Romanian population to arm itself against possible Soviet reprisals.
  • 1971
    A bomb exploded in the Liberal Party campaign rally in Plaza Miranda, Manila, Philippines with several anti-Marcos political candidates injured.
  • 1976
    Operation Paul Bunyan at Panmunjeom, Korea.
  • 1986
    Carbon dioxide gas erupts from volcanic Lake Nyos in Cameroon, killing up to 1,800 people within a 20-kilometer range.
  • 1992
    Ruby Ridge Standoff in Idaho
  • 2001
    NATO decides to send a peace-keeping force to the former Yugoslav Republic of Macedonia.
  • 2001
    The Red Cross announces that a famine is striking Tajikistan, and calls for international financial aid for Tajikistan and Uzbekistan.

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