$invoice_date = new DateAndTime(DB_DATEFORMAT, $invoice['date']);
$client = ttClientHelper::getClient($invoice['client_id'], true);
if (!$client) // In case client was deleted.
$client = ttClientHelper::getDeletedClient($invoice['client_id']);
$invoice_date = new DateAndTime(DB_DATEFORMAT, $invoice['date']);
$client = ttClientHelper::getClient($invoice['client_id'], true);
if (!$client) // In case client was deleted.
$client = ttClientHelper::getDeletedClient($invoice['client_id']);