Today in World War II History—Sept. 30, 1940 & 1945 POSTED: Wednesday, September 30, 2020 by Sarah Sundin British Observer Corps aircraft spotter on the roof of a building in London during the Battle of Britain, with St. Paul’s Cathedral in the background (US National Archives: 541899) 80 Years Ago—Sept. 30, 1940: Luftwaffe launches last major daylight raid on London, then switches to night raids. 75 Years Ago—Sept. 30, 1945: US Marines land at Tientsin, China. US ends War Savings Time (year-round Daylight Savings Time).