Question

year of second world war when it called off

Answer 1

World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945. ... World War II is generally said to have begun on 1 September 1939, with the invasion of Poland by Germany and subsequent declarations on Germany by France and the United Kingdom.

Answer 2

started 1939
stopped 1945.