I would use it. I have cornmeal in my freezer that "expired" a year ago. Unless the corn meal is contaminated with something nasty, it would be safe to eat. Eventually,the quality of the "expired" corn meal might go down a bit. But I've bought fresh stuff that had lousy quality and I wondered about it's safety. Before they came up with those tricky dates to encourage us to toss and by more stuff, we had to depend on our noses, eyes and taste buds.