diff --git a/admin/index.php b/admin/index.php
index 2926007..6acebe1 100644
--- a/admin/index.php
+++ b/admin/index.php
@@ -14,6 +14,7 @@
 	else
 		include('header.php');
 		connectdb();
+	date_default_timezone_set('UTC');
 ?>
               <li class="active"><a href="#">Admin Panel</a></li>
               <li><a href="users.php">Users</a></li>
@@ -43,13 +44,14 @@
         <div>
           <form method="post" action="update.php">
           <?php
-          	$query = "SELECT name, accept, c, cpp, java, python FROM prefs";
+          	$query = "SELECT name, start, end, c, cpp, java, python FROM prefs";
           	$result = mysql_query($query);
           	$fields = mysql_fetch_array($result);
           ?>
           <input type="hidden" name="action" value="settings"/>
           Name of event: <input name="name" type="text" value="<?php echo($fields['name']);?>"/><br/>
-          <input name="accept" type="checkbox" <?php if($fields['accept']==1) echo("checked=\"true\"");?>/> <span class="label label-important">Accept submissions</span><br/>
+          Start Time in UTC (dd/mm/yy hh:mm:ss): <input name="start" type="text" value="<?php echo(date('d/m/y H:i:s',$fields['start']));?>"/><br/>
+          End Time in UTC (dd/mm/yy hh:mm:ss): <input name="end" type="text" value="<?php echo(date('d/m/y H:i:s',$fields['end']));?>"/><br/>
           <h1><small>Languages</small></h1>
           <input name="c" type="checkbox" <?php if($fields['c']==1) echo("checked=\"true\"");?>/> C<br/>
           <input name="cpp" type="checkbox" <?php if($fields['cpp']==1) echo("checked=\"true\"");?>/> C++<br/>
diff --git a/admin/update.php b/admin/update.php
index f1f42c5..a07c916 100644
--- a/admin/update.php
+++ b/admin/update.php
@@ -8,6 +8,7 @@
  */
 	include('../functions.php');
 	connectdb();
+	date_default_timezone_set('UTC');
 	if(isset($_POST['action'])){
 		if($_POST['action']=='email') {
 			// update the admin email
@@ -39,12 +40,15 @@
 			if(trim($_POST['name']) == "")
 				header("Location: index.php?derror=1");
 			else {
-				if($_POST['accept']=='on') $accept=1; else $accept=0;
+				list($day, $month, $year, $hour, $minute) = split('[/ :]', $_POST['start']);
+				$start=mktime($hour, $minute,0, $month, $day, $year);
+				list($day, $month, $year, $hour, $minute) = split('[/ :]', $_POST['end']);
+				$end=mktime($hour, $minute,0, $month, $day, $year);
 				if($_POST['c']=='on') $c=1; else $c=0;
 				if($_POST['cpp']=='on') $cpp=1; else $cpp=0;
 				if($_POST['java']=='on') $java=1; else $java=0;
 				if($_POST['python']=='on') $python=1; else $python=0;
-				mysql_query("UPDATE prefs SET name='".mysql_real_escape_string($_POST['name'])."', accept=$accept, c=$c, cpp=$cpp, java=$java, python=$python");
+				mysql_query("UPDATE prefs SET name='".mysql_real_escape_string($_POST['name'])."', start=$start, end=$end, c=$c, cpp=$cpp, java=$java, python=$python");
 				header("Location: index.php?changed=1");
 			}
 		} else if($_POST['action']=='addproblem') {
diff --git a/index.php b/index.php
index ddbc4d9..e392d71 100644
--- a/index.php
+++ b/index.php
@@ -29,10 +29,16 @@
         if(isset($_GET['success']))
           echo("<div class=\"alert alert-success\">\nCongratulations! You have solved the problem successfully.\n</div>");
     ?>
-    Below is a list of available problems for you to solve.<br/><br/>
-      <ul class="nav nav-list">
-        <li class="nav-header">AVAILABLE PROBLEMS</li>
-        <?php
+    <?php
+	$query = "SELECT * FROM prefs";
+        $result = mysql_query($query);
+        $accept = mysql_fetch_array($result);
+	if($accept['start']>time())
+	  echo("<div class=\"alert alert-error\">\nThe contest has not started yet.\n</div>");
+	else{
+    echo"Below is a list of available problems for you to solve.<br/><br/>";
+      echo"<ul class=\"nav nav-list\">";
+        echo"<li class=\"nav-header\">AVAILABLE PROBLEMS</li>";
         	// list all the problems from the database
         	$query = "SELECT * FROM problems";
           	$result = mysql_query($query);
@@ -58,6 +64,7 @@
           	        		echo("<li><a href=\"index.php?id=".$row['sl']."\">".$row['name'].$tag."</a></li>\n");
           	    	}
 		}
+	}
 	?>
       </ul>
       <?php
diff --git a/install.php b/install.php
index 47159c1..d895dd0 100644
--- a/install.php
+++ b/install.php
@@ -27,7 +27,8 @@
 		// create the preferences table
 		mysql_query("CREATE TABLE IF NOT EXISTS `prefs` (
   `name` varchar(30) NOT NULL,
-  `accept` int(11) NOT NULL,
+  `start` int(11) NOT NULL,
+  `end` int(11) NOT NULL,
   `c` int(11) NOT NULL,
   `cpp` int(11) NOT NULL,
   `java` int(11) NOT NULL,
@@ -35,8 +36,8 @@
   `formula` text NOT NULL
 )");
 		// fill it with default preferences
-		mysql_query("INSERT INTO `prefs` (`name`, `accept`, `c`, `cpp`, `java`, `python`, `forumla`) VALUES
-('Codejudge', 1, 1, 1, 1, 1,'\$score = \$points / \$attempts')");
+		mysql_query("INSERT INTO `prefs` (`name`, `start`, 'end', `c`, `cpp`, `java`, `python`, `forumla`) VALUES
+('Codejudge', 01/01/70 00:00:00, 01/01/70 00:00:00, 1, 1, 1,'\$score = \$points / \$attempts')");
 		// create the problems table
 		mysql_query("CREATE TABLE IF NOT EXISTS `problems` (
   `sl` int(11) NOT NULL AUTO_INCREMENT,
diff --git a/solve.php b/solve.php
index 0c45fa5..ad7c721 100644
--- a/solve.php
+++ b/solve.php
@@ -47,10 +47,12 @@
         $query = "SELECT status FROM users WHERE username='".$_SESSION['username']."'";
         $result = mysql_query($query);
         $status = mysql_fetch_array($result);
-        if($accept['accept'] == 0)
+        if($accept['end'] < time())
           echo("<div class=\"alert alert-error\">\nSubmissions are closed now!\n</div>");
         if($status['status'] == 0)
           echo("<div class=\"alert alert-error\">\nYou have been banned. You cannot submit a solution.\n</div>");
+	if($accept['start']>time())
+	  header('location:index.php');
       ?>
     <h1><small>Submit Solution</small></h1>
       <?php
@@ -105,7 +107,7 @@
       Filename: <input class="span8" type="text" id="filename" name="filename" value="<?php if(!($num == 0)) echo($fields['filename']);?>"/>
       <br/>Type your program below:<br/><br/>
       <textarea style="font-family: mono; height:400px;" class="span9" name="soln" id="text"><?php if(!($num == 0)) echo($fields['soln']);?></textarea><br/>
-      <?php if($accept['accept'] == 1 and $status['status'] == 1) echo("<input type=\"submit\" value=\"Run\" class=\"btn btn-primary btn-large\"/>");
+      <?php if($accept['end'] > time() and $status['status'] == 1) echo("<input type=\"submit\" value=\"Run\" class=\"btn btn-primary btn-large\"/>");
             else echo("<input type=\"submit\" value=\"Run\" class=\"btn disabled btn-large\" disabled=\"disabled\"/>");
       ?>
       <span class="label label-info">You are allowed to use any of the following languages: