THESE EVENTS TOOK PLACE IN 1944, NOT 1943
The book canon comes before the movie canon. And in Harry Potter and the Goblet of Fire, it reads "Half a century ago, something strange had happened there..." and "Fifty years before, at daybreak, on a fine summer's morning.... a maid had entered the drawing room to find all three Riddles dead." The present is August 1994. Thus Tom Riddle, Sr. and his parents were killed in 1944, not 1943.