Depends on the manufacturing date (or canning date).
You can read on the bottom of the can the expration date and after that you add half a year more and it will still be good to eat.
Asked in Tuna
Is it safe to move an unopened can of tuna from the fridge to the pantry?
Certainly. Most Tuna will last in the can on the shelf for 2-3 years easily. There is no reason to refrigerate it unopened. ...