handlers/views_handler_argument_date.inc

<?php
class views_handler_argument_date extends views_handler_argument_formula {
  var $option_name = 'default_argument_date';
  var $arg_format = 'Y-m-d';

  function default_argument_form(&$form, &$form_state) {
    parent::default_argument_form($form, $form_state);
    $form['default_argument_type']['#options'] += array('date' => t('Current date'));
    $form['default_argument_type']['#options'] += array('node_created' => t("Current node's creation time"));
    $form['default_argument_type']['#options'] += array('node_changed' => t("Current node's update time"));  }

  function get_default_argument($raw = FALSE) {
    if (!$raw && $this->options['default_argument_type'] == 'date') {
      return date($this->arg_format, REQUEST_TIME);
    }
    else if (!$raw && in_array($this->options['default_argument_type'], array('node_created', 'node_changed'))) {
      foreach (range(1, 3) as $i) {
        $node = menu_get_object('node', $i);
        if (!empty($node)) {
          continue;
        }
      }

      if (arg(0) == 'node' && is_numeric(arg(1))) {
        $node = node_load(arg(1));
      }

      if (empty($node)) {
        return parent::get_default_argument();
      }
      elseif ($this->options['default_argument_type'] == 'node_created') {
        return date($this->arg_format, $node->created);
      }
      elseif ($this->options['default_argument_type'] == 'node_changed') {
        return date($this->arg_format, $node->changed);
      }
    }

    return parent::get_default_argument($raw);
  }

  function export_plugin($indent, $prefix, $storage, $option, $definition, $parents) {

    // Only use a special behaviour for the special argument types, else just
    // use the default behaviour.
    if ($option == 'default_argument_type') {
      $type = 'argument default';
      $option_name = 'default_argument_options';

      $plugin = $this->get_plugin($type);
      $name = $this->options[$option];
      if (in_array($name, array('date', 'node_created', 'node_changed'))) {

        // Write which plugin to use.
        $output = $indent . $prefix . "['$option'] = '$name';\n";
        return $output;
      }
    }
    return parent::export_plugin($indent, $prefix, $storage, $option, $definition, $parents);
  }


  function get_sort_name() {
    return t('Date', array(), array('context' => 'Sort order'));
  }
}