Sales summary report Daily average and Projected totals incorrect

The daily average and projected totals are calculated using the numeric month, rather than day of month. New code would look like:

function uc_reports_sales_summary() {
  $order_statuses = uc_reports_order_statuses();

  $date_day_of_month = date('j');
  $date_month = date('n');
  $month_start = mktime(0, 0, 0, $date_month, 1);
  $month_end = mktime(0, 0, 0, $date_month + 1, 1) - 1;
  $today_start = mktime(0, 0, 0);
  $today_end = mktime(23, 59, 59);