hook_date_api_fields() is not fired (converted from a support request. see first comment)

Hi,

My goal is to display a 'datetime' (MySQL) field with Views module, but unfortunately I only get "1970/01/01 - 02:33" (however the date is stored correctly in the field itself).
As I read the documentation and the few related hits I found with Google, it seems that I need to create a hook which specifies how the fields should be handled. I made the followings:
First in hook_views_data:

// Implementing hook_views_data()
function hublist_views_data()
{
	$data = array();
	// [A lot of other fields here]
	// [...]

	// Latest ping date
	$data['hublist']['stat_pingdate'] = array(
		'title' => t('Latest ping attempt'),
		'help' => t('Latest ping attempt'),
		'field' => array(
			'handler' => 'views_handler_field_date',
			'click sortable' => TRUE,
		),
		'filter' => array(
			'handler' => 'views_handler_filter_date',
		),
		'argument' => array(
			'handler' => 'views_handler_argument_date',
		),
		'sort' => array(
			'handler' => 'views_handler_sort_date',
		),
	);

Then I also have this hook in my .module file:

function hublist_date_api_fields($field) {
  $values = array(
    // The type of date: DATE_UNIX, DATE_ISO, DATE_DATETIME.
    'sql_type' => DATE_DATETIME,
    // Timezone handling options: 'none', 'site', 'date', 'utc'.
    'tz_handling' => 'site',
    // Needed only for dates that use 'date' tz_handling.
    'timezone_field' => '', 
    // Needed only for dates that use 'date' tz_handling.
    'offset_field' => '', 
    // Array of "table.field" values for related fields that should be 
    // loaded automatically in the Views SQL.
    'related_fields' => array(),
    // Granularity of this date field's db data. 
    'granularity' => array('year', 'month', 'day', 'hour', 'minute', 'second'),
  );
  
  switch ($field) {
    case 'hublist.stat_pingdate':
      return $values;
  }
  // The following return may ensure that it return the values without any condition...
  // Just for the case I made the previous switch wrong...
  return $values;
}

Could someone help me what do I wrong?