<?php
class event_handler_field_date extends views_handler_field {
  function render($values) {
    $value = strtotime($values->{$this->field_alias});
    $format = $this->options['date_format'];
    if ($format == 'custom' || $format == 'time ago') {
      $custom_format = $this->options['custom_date_format'];
    }
    
    switch ($format) {
      case 'time ago':
        return $value ? t('%time ago', array('%time' => format_interval(time() - $value, is_numeric($custom_format) ? $custom_format : 2))) : theme('views_nodate');
      case 'custom':
        return $value ? format_date($value, $format, $custom_format) : theme('views_nodate');
      default:
        return $value ? format_date($value, $format) : theme('views_nodate');
    }
  }
}