when did world war i end?

World War I effectively ended with the armistice of November 11, 1918, at 11:00 AM Central European Time (the “eleventh hour of the eleventh day of the eleventh month”). The armistice halted active fighting between the Allies and Germany and is commonly cited as the war’s end date, though the formal peace settlement—the Treaty of Versailles—was signed later, on June 28, 1919, officially concluding the conflict for many participants and laying out postwar terms. If you’d like, I can also outline how the different timelines (armistice vs. treaty) are treated in historical summaries and primary sources.