See this can? It's good until 2020. How do I know? Easy, I have cans older than that in the back reaches of my cupboard.
So long as they don't explode when I open them, or on their own, they're good to go!
Besides, these dates are all approximate and figured out by "scientists" and unreliable people like that. I say if the food doesn't kill you it makes you stronger.
Yeah, Mushroom Soup, you tell them!