Cronjob for Magento to send any invoice-emails that have not been sent yet

yr_magento_invoice_send_unsent.php

<?php
require_once 'app/Mage.php';
Mage::app();
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);
            
$from_date = date('Y-m-d', time() - (60*60*24*14));
$invoices = Mage::getModel('sales/order_invoice')->getCollection()
    ->addAttributeToFilter('created_at', array('from' => $from_date))
    ->addAttributeToFilter('email_sent', array('null' => true))
;
        
foreach($invoices as $invoice) {
    $order = $invoice->getOrder();
    if($order->getStatus() != 'complete') continue;
    $invoice->sendEmail(true);
}