Genesis Page Template displaying posts by year. Inspired by Alex Sexton's blog archives: https://alexsexton.com/blog/archives/ and built using code modified from Joe Mar Aparecio: http://www.joemaraparecio.com/customizing-genesis-archive-template-display-posts-month/

year-archive-template.php

<?php
/**
*
* Custom Blog Loop for Bradonomics.
*
* Template Name: Bradonomics Blog
*
*/

//* Remove standard post content output
remove_action( 'genesis_loop', 'genesis_do_loop' );

//* Add Page Title and Content
add_action( 'genesis_loop', 'genesis_standard_loop', 5 );

//* Add custom archive output
add_action( 'genesis_loop', 'bradonomics_blog_template'  );
function bradonomics_blog_template() {	
	
  $post_items = new WP_Query( array(
    'post_type'=> 'post',
    'showposts' => '-1',
    'order' => 'DESC',
    'orderby' => 'date'
  ));
	$set_year = '';

	while( $post_items->have_posts()) : $post_items->the_post();
		if( $set_year == '' ){
			$set_year = get_the_date(Y);
			echo '<div class="wrap"><div class="group-year"><p>' . get_the_date(Y) . '</p>';
		}else{
			if( $set_year != get_the_date(Y) ){
				echo '</div>';
				echo '<div class="group-year"><p>' .get_the_date(Y) . '</p>';
				$set_year = get_the_date(Y);				
			}
		}			
    echo '<article>';
    echo '<h3><a href="'.get_the_permalink().'">'.get_the_title().'</a></h3>';
    echo '<time><span class="month">' . get_the_date(M) . '</span> <span class="day">' . get_the_date(j) . '</span> <span class="year">' . get_the_date(Y) . '</span></time>';
    echo '</article>';
		
	endwhile;	
}

genesis();