Yes, you need to add new Post Style template to edit the format of the date. You can create your own template and copy the content of template1.php (from \wp-content\plugins\motopress-content-editor\includes\ce\shortcodes\post_grid\templates directory) Then find code below <?php echo get_the_date('F jS, Y') ?> and add this one isntead <?php echo get_the_date() ?>