<?php

$order_date = $wpo_wcpdf->export->order->order_date;
$invoice_date = get_post_meta($wpo_wcpdf->export->order->id,'_wcpdf_invoice_date',true);

$due_date = date_i18n( get_option( 'date_format' ), strtotime( $order_date . ' + 5 days') );
echo 'En Erken Kargoya Veriliş Tarihi: ' . $due_date;

?>