Comment on Stallion Responsive SEO Theme Layout Options by SEO Dave.

WordPress 2 Column Layouts Changing the copyright date isn’t a theme option, it’s based on the date of your earliest post.

That being said if you don’t mind changing code, I suppose you could add any date by replacing this code with any date:

The file footer.php

<?php the_time('Y'); ?>

Also see for possible code options. See the Related links at the bottom like the_date which might use the latest posts date (not sure).