Forum Moderators: phranque
A work is copyrighted for the life of the author, plus 70 years therafter, regardless of whether the notice is 'updated'. Only 70 years after the death of the author might others (his family/estate) wish to renew the copyright. Actually, the documentation from the U.S. Copyright Office [copyright.gov] specifies that the copyright notice should contain the date of first publication. Other countries' laws are similar, if they are signatories to international copyright treaties.
Only if you make significant changes to the content do you need to update the copyright notice -- And if you're making significant changes, you can take that opportunity to update the copyright notice as well.
If things were otherwise, you'd see book publishers having to recall their products annually, so that the copyright notice page could be updated.
If you feel you must update the copyright notice, then you can easily use PHP, PERL, or Server-Side Includes to do so.
For example, an HTML notice using SSI on Apache server:
<p>Copyright © <!--#config timefmt="%Y" --><!--#echo var="DATE_LOCAL" --> WidgetWorld, Inc.</p>
Jim