View file application/modules/Fields/View/Helper/FieldBirthdate.php

<?php
/**
 * SocialEngine
 *
 * @category   Application_Core
 * @package    Fields
 * @copyright  Copyright 2006-2020 Webligo Developments
 * @license    http://www.socialengine.com/license/
 * @version    $Id: FieldBirthdate.php 10038 2013-04-11 22:01:49Z john $
 * @author     John
 */

/**
 * @category   Application_Core
 * @package    Fields
 * @copyright  Copyright 2006-2020 Webligo Developments
 * @license    http://www.socialengine.com/license/
 * @author     John
 */
class Fields_View_Helper_FieldBirthdate extends Fields_View_Helper_FieldAbstract
{
  public function fieldBirthdate($subject, $field, $value)
  {
    if( empty($value) || empty($value->value) ) {
      return false;
    }
    $params = array(
      'size' => 'long',
      'timezone' => false,
    );
    $fieldData = $field->getElementParams($subject); 

    if(($subject instanceof User_Model_User && @$subject->birthday_format == 'monthday') || (empty(@$subject->birthday_format) && !empty($fieldData['options']) && @$fieldData['options']['birthday_format'] == 'monthday')){
      $params['format'] = 'MMMM d';
    }
    $label = $this->view->locale()->toDate($value->value,$params);
    //$str = $this->view->date($value->value);
    $parts = @explode('-', $value->value);

    // Error if not filled out
    if( engine_count($parts) < 3 || engine_count(array_filter($parts)) < 3 ) {
      //$this->addError('Please fill in your birthday.');
      return false;
    }

    $value = mktime(0, 0, 0, $parts[1], $parts[2], $parts[0]);

    // Error if too low
    $date = new Zend_Date($value);
    $birth_duration = $date->sub(time());
    if ($birth_duration instanceof Zend_Date) {
      $birth_duration = $birth_duration->toValue();
    }
    $age = (int)(- $birth_duration  / 365 / 86400);

    return $this->encloseInLink($subject, $field, $age, $label, true);
  }
}