Make an editable 'copyright' section for your client
The solution will not require the client to know what a chunk is. I usually set up generic configurations as a TV for the home page.
Create the TV
Create a new TV called copyright and assign it to the home template. You can choose Text, Textarea or Rich Textarea as input type.
As a default value use the example below:
© YourSite 2009-[[GetCurrentYear]]
Create snippet to get the current year
Create a new snippet called GetCurrentYear and paste the code below:
<?php return date("Y"); ?>
Show the TV value in all your templates
In order to display the value of the copyright TV you have to install a snippet like GetField.
Use it in your templates like:
[[GetField? &docid=`1` &field=`copyright`]]
modxRules uses this method. As an example check the copyright information present in the footer of this page.