Ray´s Guide to HTML: Defining Meta Tag Expiration Dates

The default behavior of most browsers is to cache (save) the pages you visit so that it can pull the pages from your computer instead of the internet. This takes much less time. You can specify the behavior on most browsers, however as a developer you can specify the date on which the current content of your page expires, From that point, the browser visiting must connect to your server to get the latest version. You can also instruct the browser not cache at all.

Insert a <meta> tag in the head section, setting the name and content property/value pair to expires/your_date. Date should be in Greenwich Mean Time (GTM) format.

Example:
-------------------------------------
<head>
<title></title>
<meta name="keywords" content="Ray´s Guide to HTML, Guide, HTML, Hypertext Markup Language, HTML Tutorial">
<meta name="description" content="Ray´s Guide to HTML - An introductory guide for the beginner" />
<meta name="author" content="yourname">

<meta name="expires" content="wed, 15 June 2011 02:00:00:00 GTM /">

</head>
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Don´t forget the forward slash at the end of meta tag

To prevent browser from caching at all. Enter the value of property/value to pragma/no-cache (name="pragma" content="no-cache")

Note - Greenwich Mean Time (GTM) format uses the three-character abbreviations for the days of the week (Mon, Tue, Wed, Thu, Fri, Sat, Sun), followed by the day, month, full year, and time in hours:minutes:seconds. It helps to know what your local time translates in to.
You can look up your GMT at wwp.greenwichmeantime.com

Caution - To get your site listed on a search engine you must register with them. Typically, you submit your sites URL, (your_site.something) and at some later point they will scan your site. Remember - some search engines don´t use meta data to rank sites (like Google)!