title: Why can't I insert data into the database
body: <p>The second value <code>4</code> is insert</p>
  <pre><code>$time= time() + (1 * 24*60*60);
  $rr = date('Y-M-d' , $time);
          
  $sql = &quot;INSERT INTO time_on_screen(wakeup, sleep) VALUES ( '$rr' ,4)&quot;;
  mysqli_query($conn,$sql);  
  </code></pre>