Symfony1.4でフォーマットを指定して日時のバリデーションをする方法

new sfValidatorDateTime([
    'date_format' => '/(?P<year>\d{4})-(?P<month>\d{2})-(?P<day>\d{2}) (?P<hour>\d{2}):(?P<minute>\d{2}):(?P<second>\d{2})/',
]));

new sfValidatorDateTime([
    'date_format' => '/(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})/',
    'min' => strtotime('2017-03-21 13:00:00'),
]));

  protected function convertDateArrayToString($value)
  {
    // all elements must be empty or a number
    foreach (array('year', 'month', 'day', 'hour', 'minute', 'second') as $key)
    {
      if (isset($value[$key]) && !preg_match('#^\d+$#', $value[$key]) && !empty($value[$key]))
      {
        throw new sfValidatorError($this, 'invalid', array('value' => $value));
      }
    }
    // if one date value is empty, all others must be empty too
    $empties =
      (!isset($value['year']) || !$value['year'] ? 1 : 0) +
      (!isset($value['month']) || !$value['month'] ? 1 : 0) +
      (!isset($value['day']) || !$value['day'] ? 1 : 0)
    ;
    if ($empties > 0 && $empties < 3)
    {
      throw new sfValidatorError($this, 'invalid', array('value' => $value));
    }
    else if (3 == $empties)
    {
      return $this->getEmptyValue();
    }
    ...