when was d day

D-Day occurred on June 6, 1944. It was the day of the Normandy landings during World War II, marking the start of the Allied invasion of Nazi-occupied France. The operation, known as Operation Overlord, began the liberation of Western Europe and was the largest amphibious invasion in history. The invasion was originally planned for June 5, 1944, but was delayed by one day due to bad weather. On June 6, over 150,000 Allied troops landed on five beaches in Normandy: Utah, Omaha, Gold, Juno, and Sword. This day is famously known as D-Day, where the "D" stands for "Day," indicating the day an operation begins.