My "D Day" was just a couple of weeks after the anniversary of the real D Day.
When my husband first told me there was another woman, I had never heard the term "D Day." But for some reason, one of my first thoughts was of my grandpa, who was a World War II veteran and was at the invasion of Normandy (Omaha Beach). And I thought, "If Grandpa could step onto that beach, then I sure as heck can step onto THIS one."
It wasn't until a few days later that I came here and heard the term "D Day," and when it did, the coincidence really struck me. But it also gave me a lot of strength -- it reframed the day, for me, from one of devastation to one of courage and stepping forth into something that you sure as hell don't WANT to do but HAVE to, and doing it bravely.