What day in your life was the most important? One of the most important days during World War II was D-day. Don't be mistaken by the word D-day it did not all happens in just one day but many days. D-day was just a code name for the day that Operation Overload started. D-day is very well known for the beginning of the end of the war in Europe and Hitler's rule over most of the ruined continent of Europe. Many say that if it were not for D-day Europe would have definitely fell to Hitler. So was your day this important? Did your most important day change a whole continent? (1-1) There are a few terms used when people talk about D-day. One of them is D-day, which is