At the eleventh hour on the eleventh day of the eleventh month. The Two Minute Silence is observed on Armistice Day, the day which marks the end of the First World War.
Armistice Day is commemorated every year on 11 November to mark the armistice signed between the Allies of World War I and Germany at Compiègne, France, for the cessation of hostilities on the Western Front of World War I, which took effect at eleven o’clock in the morning—the “eleventh hour of the eleventh day of the eleventh month” of 1918. The armistice initially expired after a period of 36 days. A formal peace agreement was only reached 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. In some countries Armistice Day coincides with Remembrance Day and Veterans Day, and other public holidays. Armistice Day is not celebrated in Germany, but a German national day of mourning, Volkstrauertag, has been observed on the Sunday closest to 16 November since 1952.