Interesting question. And it all has to do with one's definition of "dinner", right?

At my parent's place, dinner is between 12 noon & 1 p.m. When I'm at home or work, however, that meal is lunch. We usually refer to our our evening meal (between 5 p.m. & 7 p.m.) as supper. So, technically, unless I'm having lunch at my parent's place, I don't eat dinner. Confused?