Google Announces New Meta Tag

Google has announced a new meta tag called unavailable_after. Use this meta tag to label webpages that contain time sensitive information or an expiration date. For example, special offers, events, registrations, etc.

This tag will inform Google's spider to no longer list the web page in the search results after the expiration date.

Use the tag in the following manner, replacing the date with your expiration date:

<META NAME="GOOGLEBOT" CONTENT="unavailable_after: 25-Aug-2007 15:00:00 EST">

Read more about it at the Official Google Blog.