Google introduces new meta tag unavailable_after

Google has released a new tag “unavailable_after”, which will allow Google to prevent page indexing after a certain date. This can be useful if you have an offer on your site that is valid for a limited period of time, or other data that is free to be distributed only for a while, which after its expiration becomes paid. Then you can use the unavailable_after tag in order for Google to stop entering this data into the database and display it in the search results.