title: HTML 5 Bug Input Type Date POST Form
body: <pre><code>&lt;?php
      if(isset($_POST['VACA_INI'])){echo  "&lt;br&gt;" . $_POST['VACA_INI'];}
      else{echo "&lt;br&gt; .... NO POST VACA_INI .....";}
  
      if(isset($_POST['VACA_FIN'])){echo  "&lt;br&gt;" . $_POST['VACA_FIN'];}
      else{echo "&lt;br&gt; .... NO POST VACA_FIN .....";}
  
  
      if(isset($_POST['aaa'])){echo  "&lt;br&gt;" . $_POST['aaa'];}
      else{echo "&lt;br&gt; .... No he recibido el aaa .....";}
  ?&gt;
  &lt;!doctype html&gt;
  &lt;html class=""&gt;
  &lt;head&gt;
  &lt;meta charset="utf-8"&gt;
  &lt;meta name="viewport" content="width=device-width, initial-scale=1"&gt;
  &lt;title&gt;....&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;form name="Vacas" id="Vacas"  method="post" action=""&gt;
  &lt;input type="text" id="aaa" name="aaa" value="aaa"&gt;
  &lt;input type="date"  id="VACA_INI"  required value="2018-02-02"  &gt;&lt;/div&gt;
  &lt;input type="date"  id="VACA_FIN" value="2018-02-02"  required &gt;
  &lt;button id="Enviar" name="Enviar" type="submit" class="btn btn-primary"&gt;Enviar&lt;/button&gt;
  &lt;/form&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Return:</p>
  
  <p>.... NO POST VACA_INI .....
  .... NO POST VACA_FIN .....
  aaa</p>
  
  <p>chrome: Versión 63.0.3239.132 (Build oficial) (64 bits)</p>