Get end time from start and duration

Hi, I need some help...

I have this form with 3 fields:

echo $this->Form->input('visit_type_id', array(

    'label' => 'Tipo Visita',

));

echo $this->Form->input('start', array(

    'id' => 'start',

'label' => 'Inizio',

'dateFormat' => 'DMY',

'timeFormat' => '24',

'interval' => 15,

'minYear' => 2015,

));

echo $this->Form->input('end', array(

   'type'=>'hidden',

));

Based on "start" time and "duration" field in "visit_type_id" table I need to get "end" time into the form when submit...

I hope I've explained myself well...

thx

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