expiration date of the document

<meta http-equiv="Expires" content="">

Browser
Internet Explorer Firefox Opera
Type
Empty

This META element defines the expiration date of the document being indexed.

The META element is placed inside the HEAD element.

<meta http-equiv="Expires" content="Fri, 31 Dec 2004 23:59:59 GMT">

Attribute Value Explanation
http-equiv=" " Expires -
content=" " GMT date expiration date
seconds

The expiration date is specified by the GMT or number of seconds.

GMT Date
<meta http-equiv="Expires" content="Fri, 31 Dec 2004 23:59:59 GMT">

Number of seconds
<meta http-equiv="Expires" content="86400">

86400 sec = 24 hour
-1 sec = Disables caching of the document

Example

<html>
<head>
<meta http-equiv="Expires" content="86400">
<title>TAG index</title>
</head>
<body>



</body>
</html>