Cannot Filter

(First, if this is a views issue and not a date issue, please let me know and I will move it to views, I'm just following the instructions on the views submit request for help page.)

I'm trying to create a block of upcoming events, so I would think I need two filters, one for node type (generically called event) and one for the date (from today forward). Problem is, when I create a filter and set it to dates greater than or equal to now, no nodes are listed. Thinking I've got logic backwards, I try less than or equal to now, but now all nodes appear, both ones with a date before and after today.

What am I doing wrong?

Requested information:

The field type is date.
The type of widget is jscalendar.
The timezone is +0800 but is set to site throughout (though in this case, since the events are separated by several days, I don't think this is a timezone issue).
I'm not using the multiple option (but all entries have a to and from date/time).
I am using the required option.

If it helps, here's an export of my view:

$view = new view;
$view->name = 'upcoming_events';
$view->description = 'Upcoming Events';
$view->tag = '';
$view->view_php = '';
$view->base_table = 'node';
$view->is_cacheable = '0';
$view->api_version = 2;
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */
$handler = $view->new_display('default', 'Defaults', 'default');
$handler->override_option('fields', array(
  'title' => array(
    'label' => '',
    'link_to_node' => 1,
    'exclude' => 0,
    'id' => 'title',
    'table' => 'node',
    'field' => 'title',
    'relationship' => 'none',
  ),
  'field_date_time_value' => array(
    'label' => '',
    'link_to_node' => 0,
    'format' => 'default',
    'multiple' => array(
      'group' => TRUE,
      'multiple_number' => '',
      'multiple_from' => '',
      'multiple_reversed' => FALSE,
    ),
    'exclude' => 0,
    'id' => 'field_date_time_value',
    'table' => 'node_data_field_date_time',
    'field' => 'field_date_time_value',
    'relationship' => 'none',
  ),
));
$handler->override_option('sorts', array(
  'field_date_time_value' => array(
    'order' => 'ASC',
    'id' => 'field_date_time_value',
    'table' => 'node_data_field_date_time',
    'field' => 'field_date_time_value',
    'relationship' => 'none',
  ),
));
$handler->override_option('filters', array(
  'type' => array(
    'operator' => 'in',
    'value' => array(
      'event' => 'event',
    ),
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'type',
    'table' => 'node',
    'field' => 'type',
    'relationship' => 'none',
  ),
  'date_filter' => array(
    'operator' => '>=',
    'value' => array(
      'valuedate' => 'now',
      'mindate' => '',
      'maxdate' => '',
    ),
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'date_field' => 'node_data_field_date_time.field_date_time_value',
    'granularity' => 'day',
    'adjustment_field' => '0',
    'id' => 'date_filter',
    'table' => 'node',
    'field' => 'date_filter',
    'relationship' => 'none',
  ),
));
$handler->override_option('access', array(
  'type' => 'none',
  'role' => array(),
  'perm' => '',
));
$handler->override_option('title', 'Upcoming Events');
$handler->override_option('style_plugin', 'list');
$handler = $view->new_display('block', 'Block', 'block_1');