/*--------------------------------------------------------------*/
 /* Function for Find Activities that are not overdue
 /*--------------------------------------------------------------*/
 function find_activities_overdue($overdue){
   global $con;
   $tday = date('Y-m-d');    // current date

   $sql  = "SELECT *";
   $sql .= " FROM activities";
   if ($overdue) {
      $sql .= " WHERE (due_date < $tday)";
   } else {   
      $sql .= " WHERE (due_date >= $tday)";
   }
   $sql .= " ORDER BY due_date DESC";

   $result = mysqli_query($con,$sql);
   if($result){
     $results = while_loop($result);
   } else {
     check_query($result);
   }
   return $results;
 }