how to make countdown timer to not reset on page refresh

Problem :

I am creating an online exam page for my project. I have a countdown timer, but it resets on page refresh. How can I make it not to reset? The timer is set by fetching time from db. I am using php mysql. Please help me. Here is my code.

   $result=mysql_query("select * from test where testid='29'");
      $dateFormat  = "d F Y -- g:i a";
      $targetDate  = time() + ($time['duration']*60);
      $actualDate  = time();
      $secondsDiff = $targetDate - $actualDate;
      $remainingDay      = floor($secondsDiff/60/60/24);
      $remainingHour     = floor(($secondsDiff-($remainingDay*60*60*24))/60/60);
      $remainingMinutes  = floor(($secondsDiff-($remainingDay*60*60*24)-($remainingHour*60*60))/60);
      $remainingSeconds  = floor(($secondsDiff-($remainingDay*60*60*24)-($remainingHour*60*60))-($remainingMinutes*60));
      $actualDateDisplay = date($dateFormat,$actualDate);
      $targetDateDisplay = date($dateFormat,$targetDate);

<html xmlns="">
   <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
   <title>Untitled Document</title>
   <script type="text/javascript">
      var days = <?php echo $remainingDay; ?>  
      var hours = <?php echo $remainingHour; ?>  
      var minutes = <?php echo $remainingMinutes; ?>  
      var seconds = <?php echo $remainingSeconds; ?> 
      function setCountDown ()
          if (seconds < 0){
             seconds = 59
          if (minutes < 0){
              minutes = 59
          if (hours < 0){
              hours = 23
          document.getElementById("remain").innerHTML = "  "+hours+" hr "+minutes+" min    "+seconds+" sec";
          SD=window.setTimeout( "setCountDown()", 1000 );
          if (minutes == '00' && seconds == '00') { 
              seconds = "00"; window.clearTimeout(SD);
              window.location = "result.php"


<body onLoad="setCountDown();">
   <div id="remain">
         <?php echo "$remainingHour hours, $remainingMinutes minutes, $remainingSeconds seconds";?>

Solution :

You should read the value into session variable and using that afterwards:

if (isset($_SESSION['targetdate'])) {
    // session variable_exists, use that
    $targetDate = $_SESSION['targetdate'];
} else {
    // No session variable, red from mysql
    $result=mysql_query("select * from test where testid='29' LIMIT 1");
    $dateFormat = "d F Y -- g:i a";
    $targetDate = time() + ($time['duration']*60);
    $_SESSION['targetdate'] = $targetDate;

$actualDate = time();
$secondsDiff = $targetDate - $actualDate;
$remainingDay     = floor($secondsDiff/60/60/24);
$remainingHour    = floor(($secondsDiff-($remainingDay*60*60*24))/60/60);
$remainingMinutes = floor(($secondsDiff-($remainingDay*60*60*24)-         ($remainingHour*60*60))/60);
$remainingSeconds = floor(($secondsDiff-($remainingDay*60*60*24)-    ($remainingHour*60*60))-($remainingMinutes*60));
$actualDateDisplay = date($dateFormat,$actualDate);
$targetDateDisplay = date($dateFormat,$targetDate);


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