Many of us update and change site now and then but in this time of span your page get cached by google and you don’t want to get listed that page in google results so here is solution for this. Let’s say there is content which must not appear on Google after a certain date. Like an event page, a concert with specific dates etc.
Google, for sure, has a solution for this: unavailable_after.
Google has created a meta-tag named unavailable_after which is just for this specific need.
Here is an example code on how to use it (don’t forget to add this code between the meta-tags of that specific page):
<META NAME="GOOGLEBOT" CONTENT="unavailable_after: 01-Jan-2008 12:00:00 EST">
Just add this html syntax in your head tag and there you are :).
