What year did the Great Depression end?

Some sources say the Depression ended in 1939, but many others say it really ended in 1941. In 1939, while conditions had certainly improved, unemployment remained high; but once World War II began in late 1941, millions of men were drafted into the military, and men who did not fight were able to find employment in war-related industries such as the manufacturing of munitions or working in civil defense. Meanwhile, a large number of women also joined the labor force due to the war, and they too worked in industries necessary for the war effort, as well as holding down jobs in occupations previously held by the men who had gone off to fight.