Dubbio DATE_FORMAT()

[oly1982]

$username = $_SESSION['username']; 
$query = "
    SELECT 
        email, 
        DATE_FORMAT(data_registrazione, '%d %c %Y') AS data_reg, 
        DATE_FORMAT(ultimo_login, '%d %c %Y %H:%i') AS ultimo_log
    FROM membri 
    WHERE username='$username'";

$select = mysql_query($query) or die(mysql_error());
$campi = mysql_fetch_array($select);  
$email = $campi['email'];
$data_registrazione = $campi['data_reg'];
$ultimo_login = $campi['ultimo_log'];