Last week I mentioned that Google was putting the finishing touches on its latest META tag – unavailable_after. Now, it is officially ready for use, according to Dan Crow on the official Google Blog.
If you have a temporary page that you will eventually want to drop out of Google’s Index, this is the tag for you. For example, if you want Googlebot to stop crawling / indexing a specific page after August 31, 2007 at 1:00 p.m. Easter Standard Time, here is the syntax for the “unavailable_after” META tag:
Once Googlebot comes across that code, that particular page should drop out of the Google index about a day later. Perfect for pages that are advertising limited time offers on your web site.