Almond bark, like most food products, can be safe to use after its expiration date, but it depends on how far past the date it is and how it’s been stored. If the almond bark has been kept in a cool, dry place and shows no signs of spoilage (such as unusual odor, color changes, or mold), it is likely safe to use.
However, keep in mind that even if it’s safe, the quality (taste, texture) might not be as good as fresh almond bark. If it’s only a few months past the expiration date and shows no signs of damage, it should still be okay for most recipes.
If you’re unsure, it’s always best to check the product thoroughly before using it.