Amended post date styling, including the year

functions.php

<?php

add_filter( 'genesis_post_date_shortcode', 'child_post_date_shortcode', 10, 2 );
/**
 * Customize Post Date format and add extra markup for CSS targeting.
 *
 * Includes the year as well.
 *
 * @author Gary Jones
 * @link   http://code.garyjones.co.uk/style-post-info/
 *
 * @param string $output Current HTML markup.
 * @param array  $atts   Attributes.
 *
 * @return string HTML markup.
 */
function child_post_date_shortcode( $output, $atts ) {

	return sprintf(
		'<span class="date time published" title="%4$s">%1$s<span class="day">%2$s</span> <span class="month">%3$s</span> <span class="month">%5$s</span></span>',
		$atts['label'],
		get_the_time( 'j' ),
		get_the_time( 'M' ),
		get_the_time( 'Y-m-d\TH:i:sO' ),
		get_the_time( 'Y' )
	);

}

The last class="month"should be class="year"if I'm not mistaken :)