title: Default Data in Create/Edit Mode in Symfony's Form using DateType
body: <p>In a Symfony Form I have:</p>
  
  <pre><code>-&gt;add('fechalimite', DateType::class, [
    'format' =&gt; 'dMMMMyyyy',
    'data' =&gt; new \DateTime(),
  ])
  </code></pre>
  
  <p>Opening the form, I have in fechalimite field today's date: 15 December 2018. I can change the field, ex. 28 December 2018, and I submit the change in database without problem.</p>
  
  <p>The problem come editing the form. When I edit the field take today's date, not 28 December 2018.</p>
  
  <p>I am looking for a data default that does not remain in edit mode.</p>
  
  <p>How can solve it?</p>