Whole spices typically do not expire. Unlike fresh produce, nuts, seeds or milk, spices don’t go bad or rotten but lose their potency and flavour over time. The expiry date on the package would only mean the spices lose their potency past prime time. In other words, too-old spices are not aromatic and cannot provide flavour boost and vibrant colour to the dishes. Storing whole spices in an airtight container keeps their aromatic oils for a longer time. Thus preventing them from losing their flavour.