I have this code: 

```
<?php 
  echo "'".$sgps_newsletter->getEmail()."' demande en ".date('d.M.Y', strtotime($sgps_newsletter->getCreatedAt())) 
?> 

```

but the month name is appering in english. What can I do to show it in french? I've change the `settings.yml` default culture to french, but nothing happens.