September 1, 1939. Germany invaded Poland. Great Britain and France declared war on Germany.
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The Germans started both wars.
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the second world war began in 1939 and ended in 1945. Date specific: September 3, 1939 England and France declard war on Germany, and on September 2, 1945 Japan signed the final peace treaty.
The first world war started after the assassination of Duke Franz Ferdinand.
World War 1 started in 1914 and ended in 1918. World War II, was the amalgamation of what had initially been two separate conflicts. The first began in Asia in 1937 as the Second Sino-Japanese War; the other began in Europe in 1939 with the German invasion of Poland, however World War 2 officially started on September 1, 1939.