Google is planning to introduce a new meta tag to deal with time sensitive information on websites. The new tag -dubbed “unavailable_after” – was announced by Dan Crow, director of crawl systems at Google at a recent SEMNE conference.
The “unavailable_after” tag will for instance allow webmasters to tell Google when a particular page on their site will no longer be available. For instance, if there is a time-sensitve special offer on a site that expires on a certain date, a site owner will be able to use the unavailable_after tag to let Google know when to stop indexing that page.
I think this is actually a very good idea and long overdue, well done G!