how to see a page udpate or create date?

commonly date is contained in the page. if not, how to get it?

 

Assuming you have ssh access to the server and its linux ... there is no way to know when it was created by querying the operating system, the last update can be obtained with the output of ls -lha command inside the public_html (or however it is called) folder:

-rw-r--r-- 1 asdfasd asdf 57K Jan 12 2005 script.php
-rw-r--r-- 1 asdfasdf asdf 3.1K Dec 7 2004 page.htm
-rw-r--r-- 1 asdfasdf asdf 39K May 10 04:24 code.php

Notice the dates next to the file.