List query date

<?php
$today = date('d/m/Y');

$args = array(
    'post_type' => 'agenda',
    'posts_per_page' => -1,
    'meta_key' => '_dateCalendar',
    'meta_compare' => '>',
    'meta_value' => $today,
    'orderby' => 'meta_value',
    'order' => 'ASC');
    $query = new WP_Query($args);
    if($query->have_posts()) {