function unsubscribe($email_id, $created_at){
$servername1 = "name";
    $username1 = "name";
    $password1 = "pass";
    $dbname1 = "dbName";

    // Create connection
    $conn1 = mysqli_connect($servername1, $username1, $password1, $dbname1);
    // Check connection
    if (!$conn1) {
        die("Connection failed: " . mysqli_connect_error());
    }
    $timestamp = strtotime($created_at);
    $sql = "update email_list set unsubscribed = '" . $timestamp . "' where emailaddress = '" . $email_id . "'";
    echo "OnServer  Date = " . $created_at . " and Timestamp =  " . $timestamp . " and email = " . $email_id . "<br>";
    mysqli_query($conn1, $sql);
    mysqli_close($conn1);
}