title: Doctrine2 error : Expected format: Y-m-d
body: <p>I get this error message when I deploy my application in the production environment:</p>
  
  <blockquote>
    <p>Could not convert database value "2016-06-10 14:57:17" to Doctrine
    Type date. Expected format: Y-m-d</p>
  </blockquote>
  
  <p>What does it mean, and how can I fix it?</p>