Key Events of WWII By lianaben Aug 17, 1939 D-Day Period: Sep 1, 1939 to Aug 17, 1944 WW2 Period: Sep 26, 1940 to Sep 26, 1970 ss Aug 17, 1945 Bombing of Pearl Harbour Period: Sep 26, 2015 to Sep 28, 2015 Battle of El Alamein ddd