If the films have been refrigerated from new, I'm sure that they would be OK.
There's a lot of leeway in expiry dates, it is just the date to which the manufacturer will guarantee results indistinguishable from new film. The films don't "go bad" the next day, not like an "eat by" date on food.

(But, obviously, it's only common sense not to use expired film for that once-in-a -lifetime photo opportunity.)