Display WordPress Post By Date

i think your question has been answered in here

$args = array('posts_per_page' => -1, 'orderby' => 'date' );
$myQuery = new WP_Query($args);
$date="";
if ( $myQuery->have_posts() ) : while ( $myQuery->have_posts() ) : $myQuery->the_post();
if ( $date != get_the_date() ) {
    echo $date;
    echo '<hr />';
    $date = get_the_date();
}
the_title(); // or whatever you want here.
echo '<br />';
endwhile; endif;
wp_reset_postdata();

More info on the query here: http://codex.wordpress.org/Class_Reference/WP_Query