Hi, 

Add this code to the functions.php of the child theme:

remove_filter('vc_gitem_template_attribute_post_title_with_date', 'thegem_attribute_post_title_with_date', 10, 2);
add_filter('vc_gitem_template_attribute_post_title_with_date', 'thegem_attribute_post_title_with_date_new', 10, 2);
function thegem_attribute_post_title_with_date_new( $value, $data ) {
    extract( array_merge( array(
        'post' => null,
        'data' => ''
    ), $data ) );
    return '<div class="post-title"><h4 class="entry-title"><a href="'.esc_url(get_permalink()).'" rel="bookmark">'.mysql2date('d M Y', $post->post_date).': <span class="light">'. get_the_title($post->ID) .'</span></a></h4></div>';
}