gistfile1.php

$inputFilter->add($factory->createInput(array(
                array(
                'name' => 'birthday',
                'validators' => array(
                         array(
                             'name'                   => 'Zend\Validator\Date',
                             'break_chain_on_failure' => true,
                         )
                 ),
                 'filters' => array(
                             array(
                                 'name'    => 'Callback',
                                 'options' => array(
                                     'callback' => function ($date) {
                                         // Convert the date to database format, as allowed by the Validator\Date
                                         if (!is_array($date) || empty($date['year']) || empty($date['month']) || empty($date['day'])) {
                                             return null;
                                         }
                                         return $date['year'].'-'.$date['month'].'-'.$date['day'];
                                     }
                                 )
                             )
                         )
                )

            )));