Create a symfony widget like sfWidgetFormDateRang

1. Create the class:

<?php
class grapheWidgetFormFrequency extends sfWidgetForm
{
  protected function configure($options = array(), $attributes = array())
  {
    $this->addRequiredOption('number');
    $this->addRequiredOption('type');

    $this->addOption('template', '%number% - %type%');
  }

  public function render($name, $value = null, $attributes = array(), $errors = array())
  {
    $values = array_merge(array('number' => '', 'type' => '', 'is_empty' => ''), is_array($value) ? $value : array());

    return strtr($this->translate($this->getOption('template')), array(
      '%number%'      => $this->getOption('number')->render($name.'[number]', $value['number']),
      '%type%'        => $this->getOption('type')->render($name.'[type]', $value['type']),
    ));
  }

  public function getStylesheets()
  {
    return array_unique(array_merge($this->getOption('number')->getStylesheets(), $this->getOption('type')->getStylesheets()));
  }

  public function getJavaScripts()
  {
    return array_unique(array_merge($this->getOption('number')->getJavaScripts(), $this->getOption('type')->getJavaScripts()));
  }
}

2. use it in form class:

class ImportScheduleForm extends BaseImportScheduleForm
{
  public function configure()
  {    
　　　　$type = array('' => '',
                    'hour' => 'hour',
                    'day' => 'day',
                    'week' => 'week',
                    'month' => 'month',
                    'year' => 'year',
                   );
    $this->widgetSchema['frequency'] = new grapheWidgetFormFrequency(array(
        'number' => new sfWidgetFormInput(array(), array('size' => '1')),
        'type' => new sfWidgetFormChoice(array('choices' => $type)),
    ));
　　}
}

3. forset values into the form and update the db:

class ImportScheduleForm extends BaseImportScheduleForm
{
  public function updateDefaultsFromObject()
  {
      parent::updateDefaultsFromObject();
      $freq = explode('-', $this->getObject()->getFrequency());
      $this->setDefault('frequency', array(
          'number' => $freq[0],
          'type' => $freq[1]
      ));
  }
  
  public function updateObject($values = null)
  {
      if (null === $values){
          $values = $this->values;
      }
      //var_dump($values['frequency']['number'],$values['frequency']['type']);die();
      $obj = parent::updateObject($values);
      $obj->setFrequency($values['frequency']['number'].'-'.$values['frequency']['type']);
      
      return $obj;
  }
}

Ref:　http://pookey.co.uk/wordpress/archives/170-datetime-range-selector-widget-for-symfony