projekt kivitendo

    $new_order->tax_point(

      $self->add_months(

        $period_start_date, $self->get_billing_period_length || $self->get_order_value_period_length || 1

    );

    my @items;

    for my $item ($orig_order->items) {

  $new_date->add(months => $months);

  # stay in month: 31.01 + 1 month should be 28.02 or 29.02 (not 03.03. or 02.03)

  while (($start_months_of_date + $months) % 12 != $new_date->month % 12) {

  }

  # if date was at end of month -> move new date also to end of month