Veterans Day is celebrated on November 11 because it is the anniversary of the signing of the Armistice that ended World War I in 1918. The Germans signed the Armistice on the eleventh hour of the eleventh day of the eleventh month of that year.
November 11 is remembered in the United Kingdom as “Remembrance Day” and as “Armistice Day” in France. In some locales a moment of silence is kept at the eleventh hour.
In 1968, the United States moved Veterans Day to the nearest Monday (to ensure a three-day weekend), was moved back to the 11th because of the protests. It is officially November 11th.