The Armistice Day reference article from the English Wikipedia on 24-Jul-2004
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Armistice Day

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Armistice Day is the anniversary of the official end of World War I, November 11, 1918. It commemorates the armistice signed between the Allies and Germany for the cessation of hostilities on the Western Front, which took effect at eleven o'clock in the morning—the "eleventh hour of the eleventh day of the eleventh month."

This was celebrated as a national holiday each year in many of the former allied nations. After World War II, it was changed to Veteran's Day in the United States and to Remembrance Day in the British Commonwealth.

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This official date to mark the end of the war reflects the ceasefire on the Western Front. Hostilities continued in other regions, especially across the former Russian Empire and in parts of the old Ottoman Empire.