During the 3rd SEMNE (Search Engine Marketing England), Director of crawl systems from Google Dan Crow introduced the new Meta tag called “unavailable_after” which will allow webmasters to instruct Googlebot when a specific webpage will no longer be available for indexing. For example, if you have a special offer on your website that will expire on a specific period or some pages are available free for a week, you can use the “unavailable_after” tag to let Googlebot knows when to stop indexing.
For instance, to identify that an HTML webpage should be removed from the Google search results after 6pm Eastern Standard Time (EST) on 5th November 2007, simply add the following Meta tag to the first section of the page.
This tag will be treated by Google as an exclusion request and will take effect the day after the exclusion period passes. It is helpful if you have a temporary web page that will be removed at the specific date.
For more information on SEMNE, please visit SEMNE.ORG
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