dateSelectType.php

$form   = $this->createForm(new dateSelectType(), array('id'=>$id));

public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('id', 'hidden')
            ->add('startDate', 'text',
                array(
                    'attr' => array('class' => 'date'),
                    'required' => false,
                    'label' => "Select Date"));
    }