Que código estas usando?
Ya que:
Código PHP:
Ver original//Mal
$date = DateTime::createFromFormat("l dS F Y", $dateFromDB);
echo $date; //Error Object of class DateTime could not be converted to string
//Bien
$date = DateTime::createFromFormat("l dS F Y", $dateFromDB);
$date = $date->format('d/m/Y');
echo $date;
Saludos