// anywhere
printf( 'Copyright © 2010-%s COMPANY_NAME. All Rights Reserved', date( 'Y' ) );
// in WP with translation/textdomain
printf( __( 'Copyright © 2010-%s COMPANY_NAME. All Rights Reserved', 'textdomain' ), date( 'Y' ) );
// can also make future year(s) conditional
$year = date('Y');
$copyright_years = $year == '2014' ? $year : '2014-'.$year;