Displaying the last modified date of a web page using Javascript is just a matter of diplaying the document.lastModified property of Javascript.

document.lastModified;

In order for this property to work, the server has to send the information to the browser. which is widely supported by the browsers nowadays.

When a server does not send a lastModified date information to the browser, Netscape and Opera give a last modification date of 01/01/1970 at 00:00:00 hrs, while Internet Explorer gives today. So it is always a good practice to test the server if it is sending the necessary information to the browser before using this script.

document.lastModified

document.write(document.lastModified);

outputs: 18/01/2008 16:43:32