from Wikipedia >> The end of World War II in Asia occurred on
2 September 1945, when armed forces of the Empire of Japan surrendered
to the forces of the Allies. The surrender came almost four months after
the surrender of the Axis forces in Europe and brought an end to World War II.
Dad would tell the story about arriving in Japan three days after the war ended,
Based on this date from Wikipedia he would have arrived on 5 September, 1945.