protected function getFilterData()
{
$date = Mage::getSingleton('core/date');
$data = parent::getFilterData();
if (!$data->hasData('from')) {
$data->setData('from', $date->gmtDate(null, $date->gmtTimestamp() - 30 * 24 * 60 * 60));
}
if (!$data->hasData('to')) {
$data->setData('to', $date->gmtDate(null, $date->gmtTimestamp()));
}
if (!$data->hasData('period_type')) {
$data->setData('period_type', 'day');
}
return $data;
}
