VJ day is one of the most important dates in world history, as it celebrates victory in World War Two. The Second World War, which lasted from 1939 to 1945, was one of the most deadly in human history and was fought over several fronts. The Allies celebrated as they conquered each front, with the first taste of victory in Europe, celebrated as VE Day on May 9, 1945. VJ Day celebrates the official end to war hostilities on all fronts.