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<?php
// Range les évènement du calendrier par date (custom field "date")
function custom_post_order($query){
    $post_type = $query->get('post_type');
    
    if($post_type == 'calendrierformations'){
        $query->set('orderby', 'meta_value');
        $query->set('meta_key', 'date');
        $query->set('order', 'ASC');
    }
}
if(is_admin()){
    add_action('pre_get_posts', 'custom_post_order');
}