Method 1: Using the footer block
In that box, you could input the following code, which uses PHP to display the year dynamically:
Both end up with the following displaying:
© Headway Themes 2015. All Rights Reserved.
So for PHP the important part is the
<?php echo date('Y');?> Put that wherever you want the year to display.
Method 2: Use a custom code block
But you can use the same code as above. Easy, right?