diff --git a/Course.php b/Course.php
index 05b3e1f..c469163 100644
--- a/Course.php
+++ b/Course.php
@@ -152,7 +152,7 @@ include 'Header.php';
 				$att3 = $row['Attachment_link_3'];
 				$att4 = $row['Attachment_link_4'];
 				$labid = $row['Lab_Report_ID'];
-				$days_remaining = date_diff(date_create($deadline), date_create())->format('%a days, %h hours, %i minutes');
+				$days_remaining = "Days remaining: ".date_diff(date_create($deadline), date_create())->format('%a days, %h hours, %i minutes');
 				$full_link = "<a href='~\..\Download.php?file=$att1'>$att1</a>";
 
 				if($att2 != "") {
@@ -165,6 +165,11 @@ include 'Header.php';
 				    $full_link = $full_link."| <a href='~\..\Download.php?file=$att4'>$att4</a>";
 				}
 
+				// check if the student has already submitted the assignment
+				$query_result = mysqli_query($con, "SELECT * FROM lab_report_submissions WHERE Student_id=$student_id AND Lab_Report_ID=$labid");
+				if (mysqli_num_rows($query_result) > 0)
+				    $days_remaining = 'You have already submitted this assignment.';
+
 				echo "<div class='card mt-md-2' style='word-wrap: break-word;'>
                                           <div class='card-body'>
                                               <h5 class='card-title'>$title</h5>
@@ -172,7 +177,7 @@ include 'Header.php';
                                               <p class='card-text'> $ins </p>
                                               <p> <small>Attachments</small>: $full_link </p>
                                               <p class='card-text'> <small> Posted: $posted  &nbsp;&nbsp; Deadline: $deadline </small> </p>
-                                              <div class='alert alert-warning'>Time left: $days_remaining</div>
+                                              <div class='alert alert-warning'>$days_remaining</div>
                                               <p><a href='~\..\SubmitLab.php?id=$labid&url=$url' class='btn btn-primary'>Submit</a></p>
                                           </div>
                                       </div>";