Japanese Occupation By 17johnstonj1 Dec 8, 1941 Japanese Attack Dec 13, 1941 battle for HK Dec 25, 1941 British gave up HK (Black Christmas) Period: Dec 25, 1941 to Aug 15, 1945 Japanese Occupation Jan 1, 1942 HK dollars outlawed and replaced by military yen Aug 6, 1945 U.S Dropped atomic bomb on Horoshima Aug 9, 1945 U.S Dropped atomic bomb on Nagasaki Aug 15, 1945 Japan surrender