Adds the last modified time to the admin interface as well as a [last-modified] shortcode to use on the front-end. Over-powered.
Simple plugin that checks your WordPress install and shows your file permissions, size, and last modified date.
Sends to a client correct HTTP headers Last Modified, Cache Control and 304 Not Modified
This plugins adds the last modified date, current revision and the publication date of your post/page. Simply use the shortcode [last_modified_date]
Automatically send HTTP Header "last-modified".
Use Post Updated Date Plugin to Add Last Updated Date in WordPress Blog Posts.
Adds the ETag, Last-Modified, and if appropriate 304 headers to HTTP responses generated by WordPress for more efficient caching.