Armistice Day, later known as Remembrance Day in the Commonwealth and Veterans Day in the United States, is commemorated every year on 11 November to mark the armistice signed between the Allies of World War I and Germany at Compiègne, France, at 5:45 am for the cessation of hostilities on the Western Front of World War I, which took effect at eleven in the morning—the "eleventh hour of the eleventh day of the eleventh month" of 1918. But, according to Thomas R. Gowenlock, an intelligence officer with the U.S. First Division, shelling from both sides continued for the rest of the day, ending only at nightfall. The armistice initially expired after a period of 36 days and had to be extended several times. A formal peace agreement was reached only when the Treaty of Versailles was signed the following year.

The date is a national holiday in France, and was declared a national holiday in many Allied nations. However, many Western countries and associated nations have since changed the name of the holiday from Armistice Day, with member states of the Commonwealth of Nations adopting Remembrance Day, and the United States government opting for Veterans Day. In some countries Armistice Day coincides with other public holidays.