Sort custom post type by custom field not working

Hi there,

I am trying to display my custom post type ‘events’ in event date ascending order but am having no luck! I am also only displaying events if they are in the future. I believe I have followed instructions on how to order by custom post type correctly –

// Get the current date
    $current_date = date('M d, Y', time() - 86400);
    $current_date = strtotime( $current_date );

    $args = array( 'post_type' => 'events', 'meta_key' => 'event_date', 'orderby' => 'meta_value_num', 'order' => ‘ASC’ );

      $loop = new WP_Query( $args );
      while ( $loop->have_posts() ) : $loop->the_post(); 

     // Get the custom field
    $post_date = get_field('event_date');
    $post_date = strtotime( $post_date );

    // If older than current date, don't show it
    if( $post_date > $current_date ): ?>
			<article class="event">MY POST STUFF</article>

    <?php  endif; /* END DATE FILTER */
    endwhile; // END LOOP ?>

Has anyone got any suggestions?
Thanks