how to create a web part to track page creation time

I am new to SharePoint Server 2007 Web Part, and I am using SharePoint Server 2007 on Windows Server 2008. I program using VSTS 2008 + C# + .Net 3.5.

I want to create a simple web part which could displ开发者_如何学编程ay page creation time and modified time (display such time information at the bottom of a web page).

Any reference code samples or tutorials -- anything helpful for a newbie of SharePoint 2007 Web Part or this specific time tracking issue is helpful.

Here is one example, implemented as a custom footer

http://itfootprint.wordpress.com/2007/10/18/sharepoint-footer-custom-control-last-modified-date/