title: alert date of return is the same as datepickup
body: <p>i have this code and i need a good condition to stop people booking for one day </p>
  
  <pre><code>$output['date_pickup'] = $pickup;
  $output['date_return'] = $return;
  
  // strtotime
  $pickup_dtime = strtotime( $output['date_pickup'] . $output['time_pickup'] );
  $return_dtime = strtotime( $output['date_return'] . $output['time_return'] );
  
  // PAST TIME?
  if ( date('Y-m-d') == $output['date_pickup'] &amp;&amp; date_i18n('H:i') &gt; $output['time_pickup'] )
      $error .= sprintf(__('Today, you cannot book before %s.', 'textZ'), date_i18n('H:i')) . '&lt;br /&gt;';
  </code></pre>
  
  <p>i try this code but i can't reserve any way the date of retrn is bigger than 24H</p>
  
  <pre><code>if ( $return &lt; 86400 )
      $error .= __('today you cannot book.', 'textZ') . '&lt;br /&gt;';
  </code></pre>
  
  <p>So can you help please</p>