icon. This will automatically format your date and time correctly.This tag can be set so that search engines and some proxy servers either delete the page from their listings or refresh their cache. Use of this tag is also supported by some browsers. If this tag is needed, use the format 'day, date time GMT'. The time must be set in GMT, an example would be 'Mon, 28 Nov 2007 15:13:00 GMT'
If you select no, then you do not need to include an expiry date. If you select yes, we have included a handy date selector found by clicking the icon. This will automatically format your date and time correctly.
Please note that many proxy servers are not able to read HTML files, and in this case webmasters will need to ensure a HTTP header is sent instead. If your pages are plain HTML files then contact your webhosting company or IT administrator to setup this header. If you are using a scripting language such as cgi, php, asp, asp.net, then simply define your headers at the top of your script.