The Last Modified Footer plugin generates a message stating the date / time the content being viewed was last modified. This information can be placed in the site footer, or elsewhere on the page
For homepage, archive pages (categories, tags and authors), search results and 404 error pages, something similar to the following text will be generated:
Site last updated October 1, 2007
For single posts, pages and attachments something similar to the following text will be generated:
Site last updated October 1, 2007; This content last updated October 1, 2007
The message templates, placement and styling as well as the format of the time and date can be modified via the Last Modified Footer administration panel (‘Settings’ > ‘Last Modified Footer’).
Free Download: Download this wp-plugin