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add_filter( 'genesis_post_info', 'add_modified_date_post_info' );
function add_modified_date_post_info($post_info) {
	$post_info = 'Updated: [modified_date] by [post_author_posts_link] [post_comments] [post_edit]';
	return $post_info;
}

add_shortcode( 'modified_date', 'wpsites_modified_date_shortcode' );
/**
 * Generates the modified date of the post.
 * @author    Brad Dalton
 * @example   http://wpsites.net/
 * @copyright 2014 WP Sites
 */
function wpsites_modified_date_shortcode( $atts ) {

	$defaults = array(
		'after'  => '',
		'before' => '',
		'format' => get_option( 'date_format' ),
		'label'  => '',
	);

	$atts = shortcode_atts( $defaults, $atts, 'modified_date' );

	$display = ( 'relative' === $atts['format'] ) ? genesis_human_time_diff( get_the_time( 'U' ), current_time( 'timestamp' ) ) . ' ' . __( 'ago', 'genesis' ) : get_the_modified_date( $atts['format'] );

	if ( genesis_html5() )
		$output = sprintf( '<time %s>', genesis_attr( 'entry-time' ) ) . $atts['before'] . $atts['label'] . $display . $atts['after'] . '</time>';
	else
		$output = sprintf( '<span class="date published time" title="%5$s">%1$s%3$s%4$s%2$s</span> ', $atts['before'], $atts['after'], $atts['label'], $display, get_the_modified_date( $d ) );

	return apply_filters( 'genesis_post_date_shortcode', $output, $atts );

}