$m_end = $y == $year_end ? intval($month_end) : 12;
            for ($m = $m_start; $m <= $m_end; $m++) {
                $period = $y . str_pad($m, 2, '0', STR_PAD_LEFT);
                ReportBookkeeping::$output_query_as_table = true;
                $result = ReportBookkeeping::queryInvoices($period);
                echo '<h3 style="margin:0 0 10px 0;">' . $period . '</h3>';
                foreach ($result as $key => $value) {
                    if (strpos($key, 'qty') !== false) {
                        $value_used = intval($value);
                    } else {
                        $value_used = number_format($value, 2);
                    }
                    echo '<div>' . ucwords(str_replace('_', ' ', $key)) . ' = ' . $value_used . '</div>';
                }
                $receipts = ReportBookkeeping::getTotalReceipts($period);
                $returns = ReportBookkeeping::getTotalReturns($period);
                echo '<div>Total Amount Received = ' . number_format($receipts, 2) . '</div>' . '<div>Total Returns (including refund & non refund, ' . 'shipping cost and small amount adjustment) = ' . number_format($returns, 2) . '</div>' . '<div>&nbsp;<br />&nbsp;</div>';
            }
        }
    }
} else {
    //WHEN CALLED WITHOUT SPECIFIC PERIOD (BY CRON)
    //NO NEED TO DISPLAY RESULT AND SAVE QUERIED DATA OF CURRENT PERIOD
    //set timetamp based on when cron is called,
    //if >=23 then consider grabbing today as period
    //else then always use previous day as period
    ReportBookkeeping::setOptionArchiveQueryAsExcel(true);
    $logger->write('Generating Period');
    $period_timestamp = date('G') >= 23 ? time() : strtotime('-1 day');
    $period = date(ReportBookkeeping::PERIOD_DATE_FORMAT, $period_timestamp);
    $logger->write('Query Invoices in Period');