public function valueNode()
{
// date value (either a DateTime object, or null)
$valueNode = parent::valueNode();
// format('Y-m-d') method call on date object
$args = new \Twig_Node_Expression_Array([], $this->lineno);
$args->addElement(new \Twig_Node_Expression_Constant('j M, Y', $this->lineno));
$formatNode = new \Twig_Node_Expression_MethodCall($valueNode, 'format', $args, $this->lineno);
// conditional to check for a null value
$conditionalNode = new \Twig_Node_Expression_Conditional($valueNode, $formatNode, $valueNode, $this->lineno);
return $conditionalNode;
}
