D-DayD-Day /ˈdiː deɪ/ 
6th June, 1944; in World War II, the day the Allies landed in France to begin the spread of their forces through Europe, under the command of General Eisenhower. D-Day is sometimes used to describe the day on which an important operation or planned action will begin.
6th June, 1944; in World War II, the day the Allies landed in France to begin the spread of their forces through Europe, under the command of General Eisenhower. D-Day is sometimes used to describe the day on which an important operation or planned action will begin.- Royal Greenwich Observatory
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