function getDateOfLastOrder($account_id)
{
global $wpdb;
$lastdate = $wpdb->get_var($wpdb->prepare("\n\t\t\tSELECT LastTimeModified\n\t\t\tFROM {$this->tablename}\n\t\t\tWHERE account_id = %s\n\t\t\tORDER BY LastTimeModified DESC LIMIT 1\n\t\t", $account_id));
// if there are no orders yet, check the date of the last transaction
if (!$lastdate) {
$tm = new TransactionsModel();
$lastdate = $tm->getDateOfLastCreatedTransaction($account_id);
if ($lastdate) {
// add two minutes to prevent importing the same transaction again
$lastdate = mysql2date('U', $lastdate) + 120;
$lastdate = date('Y-m-d H:i:s', $lastdate);
}
}
return $lastdate;
}
