Copyright years in footer text are usually updated manually. To make them automatically update each year without regenerating the application a simple script can be used.
Two examples below. One shows copyright based on a year range and one on a single year. Simply copy and paste into the footer text field on the HTML > General tab > Footer text
Single Year eg Changes to current year automatically:
©<script>document.write(new Date().getFullYear())</script> Your Company Name. All rights reserved.
Year Range Example:
©2010-<script>document.write(new Date().getFullYear())</script> Your Company Name. All rights reserved.
Just set it and forget it!