Validation::time PHP Method

    public static function time($value)
    {
        $regex = '/^([01]\\d|2[0-3])(:[0-5]\\d){1,2}$' . '|^(0?[1-9]|1[0-2])(:[0-5]\\d){1,2}\\s?[AaPp]m$/';
        return (bool) preg_match($regex, $value);
    }

 /**
  * checkDatetimeType
  *
  * @param array $question question
  * @param string $answer answer value
  * @return array error message
  */
 public function checkDatetimeType($question, $answer)
 {
     $errors = array();
     if ($question['question_type_option'] == QuestionnairesComponent::TYPE_OPTION_DATE) {
         if (!Validation::date($answer, 'ymd')) {
             $errors[] = sprintf(__d('questionnaires', 'Please enter a valid date in YY-MM-DD format.'));
         }
     } elseif ($question['question_type_option'] == QuestionnairesComponent::TYPE_OPTION_TIME) {
         if (!Validation::time($answer)) {
             $errors[] = sprintf(__d('questionnaires', 'Please enter the time.'));
         }
     } elseif ($question['question_type_option'] == QuestionnairesComponent::TYPE_OPTION_DATE_TIME) {
         if (!Validation::datetime($answer, 'ymd')) {
             $errors[] = sprintf(__d('questionnaires', 'Please enter a valid date and time.'));
         }
     }
     return $errors;
 }