public function setNextInvoiceDate($date)
    {
        $date = DateTime::createFromFormat('Y-m-d', $date);

        $this->next_invoice_date = new stdClass();
        $this->next_invoice_date->day = $date->format('d');
        $this->next_invoice_date->month = $date->format('m');
        $this->next_invoice_date->year = $date->format('Y');

        return $this;
    }