ติดปัญหา time zone setting ในไฟล์ dashboard.php พอจะมีวิธีแก้ไหมครับ

<?php
  include 'config1.php';
	
	$todayYMD = date("Y-m-d");
	$today = date("d/m/Y");
	$todayQuery = date("d-m-Y");
	$todayTimestamp = strtotime($today);
	$userId = $_SESSION['uid'];
?>

<div class="row">
	<div class="col-lg-5">
		<div class="panel panel-danger">
			<div class="panel-heading">
			  <h3 class="panel-title text-center"><b>Pending Attendance</b></h3>
			</div>
			<div class="panel-body text-center">
				  <?php
					  
					  for($i = 1; $i < 8; $i++) {
						  $dateCurrentYMD = date('Y-m-d', strtotime($todayYMD ." -$i day"));
					  
						  $queryTimeStamp = strtotime($dateCurrentYMD);
						  $dateCurrent = date('d/m/Y', $queryTimeStamp);
										  
						  $query_subjectPending = "SELECT subject.name, subject.id from subject INNER JOIN user_subject WHERE user_subject.id = subject.id AND user_subject.uid = {$_SESSION['uid']}  ORDER BY subject.name";
						  $subPending=$conn->query($query_subjectPending);
						  $rsubPending=$subPending->fetchAll(PDO::FETCH_ASSOC);
						  $today = date("d/m/Y");
						  $todayQuery = date("d-m-Y");
						  $todayDBQuery = strtotime(date("Y-m-d"));
						  $noOfSubjectPending = count($rsubPending);
						  
						  $weekday= strtolower(date("l", strtotime($dateCurrentYMD)));
						  
						  if(($weekday!="saturday") && ($weekday!="sunday")) {
							  for($j = 0; $j<$noOfSubjectPending; $j++) {
								  $subIdP = $rsubPending[$j]['id'];
								  $sqlPending = "SELECT sid, ispresent FROM attendance WHERE id=$subIdP AND date=$queryTimeStamp AND uid=$userId";
								  $stmtP = $conn->prepare($sqlPending); 
								  $stmtP->execute();
								  $resultP = $stmtP->fetchAll(PDO::FETCH_ASSOC); 
								  if(!empty($resultP)){
									  print "<p><a href='index.php?subject=" . $subIdP . "&date=" . $dateCurrentYMD ."' style='text-decoration:none;'>Class: <strong style='color:#555;'>" . $rsubPending[$j]['name'] ."</strong> of <strong>" . $dateCurrent ."</strong></a> <span class='label label-success' style='border-radius:0%;'>Attendance Recorded</span> </p>";
								  }
								  else {
									  print "<p><a href='index.php?subject=" . $subIdP . "&date=" . $dateCurrentYMD ."' style='text-decoration:none;'>Class: <strong style='color:#555;'>" . $rsubPending[$j]['name'] ."</strong> of <strong>" . $dateCurrent ."</strong></a> <span class='label label-danger' style='border-radius:0%;'>Mark Attendance Now!</span></p>";
								  }
							  }
							  
							  if ($i !== 7) {
								  print "<hr>";
							  }
						  }
					  }
						  
				  ?>
				  
			</div>
		  </div>
	</div>

	<div class="col-md-5">
		<div class="panel panel-primary">
			<div class="panel-heading">
			  <h3 class="panel-title text-center"><b>Today's Attendance</b></h3>
			</div>
			<div class="panel-body text-center">
				  <?php
					  
				  
					  $query_subject = "SELECT subject.name, subject.id from subject INNER JOIN user_subject WHERE user_subject.id = subject.id AND user_subject.uid = {$_SESSION['uid']}  ORDER BY subject.name";
					  $sub=$conn->query($query_subject);
					  $rsub=$sub->fetchAll(PDO::FETCH_ASSOC);
					  $today = date("d/m/Y");
					  $todayQuery = date("d-m-Y");
					  $todayDBQuery = strtotime(date("Y-m-d"));
					  $noOfSubject = count($rsub);
					  
					  for($i = 0; $i<$noOfSubject; $i++) {
						  $subId = $rsub[$i]['id'];
						  $sql = "SELECT sid, ispresent FROM attendance WHERE id=$subId AND date=$todayDBQuery AND uid=$userId";
						  $stmt = $conn->prepare($sql); 
						  $stmt->execute();
						  $result = $stmt->fetchAll(PDO::FETCH_ASSOC); 
						  if(!empty($result)){
							  print "<p><a href='index.php?subject=" . $subId . "&date=" . $todayQuery ."' style='text-decoration:none;'>Class: <strong style='color:#555;'>" . $rsub[$i]['name'] ."</strong> of <strong>Today's</strong> (" . $today .")</a> <span class='label label-success' style='border-radius:0%;'>Attendance Recorded</span> </p>";
						  }
						  else {
							  print "<p><a href='index.php?subject=" . $subId . "&date=" . $todayQuery ."' style='text-decoration:none;'>Class: <strong style='color:#555;'>" . $rsub[$i]['name'] ."</strong> of <strong>Today's</strong> (" . $today .")</a> <span class='label label-danger' style='border-radius:0%;'>Mark Attendance Now!</span></p>";
						  }
					  }
				  ?>
			</div>
		  </div>
	</div>

	<div class="col-lg-2">
		<div class="panel panel-success">
			<div class="panel-heading">
			  <h3 class="panel-title text-center"><b>You Have:</b></h3>
			</div>
			<div class="panel-body text-center">
			  <p><i class="fa fa-book"></i> <a href="index.php?page=studentinfo" style='text-decoration:none;'> <strong><span class="badge badge-pill badge-danger"><?php print $noOfSubject; ?></span></strong> Subject/s </a></p>
				  <?php
					  $studentQuery = "SELECT COUNT(DISTINCT sid) as student_count FROM `user_subject` INNER JOIN student_subject WHERE user_subject.id = student_subject.id AND user_subject.uid = $userId";
					  $stmtStudent = $conn->prepare($studentQuery); 
					  $stmtStudent->execute();
					  $resultStudent = $stmtStudent->fetchAll(PDO::FETCH_ASSOC); 
				  ?>
				  
				  <?php if(!empty($resultStudent)) : ?>
					  <p><i class="fa fa-users"></i> <a href="index.php?page=studentinfo" style='text-decoration:none;'><strong><span class="badge badge-pill badge-danger"><?php print $resultStudent[0]['student_count'] ?></span></strong> Student/s</a></p>
				  <?php else: ?>
					  <p><i class="fa fa-users"></i> No Students assigned to you!</p>
				  <?php endif; ?>
			</div>
		  </div>
	</div>
</div>

<div class="row">
	<div class="col-lg-2"></div>

	<div class="col-lg-7">
		
	</div>

	<div class="col-lg-3">
		
	</div>
</div>