在symfony 1.4中单独的开始日期和结束日期

I have a form filter and in symfony 1.4 and i have a widget sfWidgetFormFilterDate

'datedepot'           => new sfWidgetFormFilterDate(array('from_date' => new sfWidgetFormDate(), 'to_date' => new sfWidgetFormDate(), 'with_empty' => false)),

the problem is i can't separate the start date and end date in the template.

<?php echo $filter['datedepot']->render() ?>

How i can sep separate the start date and end date in the template ?