What Day Of The Week Is December 21?

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Monday December 21, 2026
A date scroll with Latin text from “The Extremes of Good and Evil” by Cicero, written in 45 BC.

December 21: Day of the Week

December 21, 2026 is the 355th day of the year 2026 in the Gregorian calendar. There are 10 days remaining until the end of the year. The day of the week is Monday.

If you are trying to learn Japanese then this day of the week in Japanese is Getsuyōbi.

Here’s the December calendar. You can also browse the full year monthly calendar.

December 2026
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Zodiac & Birthstone

Sagittarius is the zodiac sign of a person born on this day. Turquoise is the modern birthstone for this month. Onyx is the mystical birthstone from Tibetan origin that dates back over a thousand years.

December 21: This Day in History

This is a frequent day for the winter solstice to occur in the northern hemisphere and summer solstice to occur in the southern hemisphere.

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December 21 by the Numbers

  • 309 days since December 21
  • 0 year, 10 months, and 6 days ago
  • 10 months since then
  • December 21 is in the 52nd week of the year 2026 (ISO 8601)
  • 44 weeks ago
  • The year 2026 is not a leap year

December 21 Historical Event(s)

69The Roman Senate declares Vespasian as Roman emperor, the last in the Year of Four Emperors. 1140Conrad III of Germany besieged Weinsberg. 1844The Rochdale Pioneers commence business at their cooperative in Rochdale, England, starting the Cooperative movement. 1861Medal of Honor: Public Resolution 82, containing a provision for a Navy Medal of Valor, is signed into law by President Abraham Lincoln. 1872Challenger expedition: HMS Challenger, commanded by Captain George Nares, sails from Portsmouth. 1913Arthur Wynne’s “word-cross”, the first crossword puzzle, is published in the New York World. 1937Snow White and the Seven Dwarfs, the world’s first full-length animated feature, premieres at the Carthay Circle Theater. 1941World War II: A formal treaty of alliance between Thailand and Japan is signed in the presence of the Emerald Buddha in Wat Phra Kaew. 1962Rondane National Park is established as Norway’s first national park. 1979Lancaster House Agreement: An independence agreement for Rhodesia is signed in London by Lord Carrington, Sir Ian Gilmour, Robert Mugabe, Joshua Nkomo, Bishop Abel Muzorewa and S.C. Mundawarara.

Who were born on December 21?

1795John Russell, English parson and dog breeder (d. 1883) 1805Thomas Graham, British chemist (d. 1869) 1859Gustave Kahn, French poet (d. 1936) 1872Sidney Ainsworth, British actor (d. 1922) 1891John William McCormack, American politician (d. 1980) 1947Bryan Hamilton, Northern Irish footballer 1949Thomas Sankara, Burkinabé military figure (d. 1987) 1973Karmen Stavec, German-born Slovenian singer 1987Valerie Concepcion, Filipino actress 1989Tamannaah, Indian actress

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