/**
* Add a type selector to the value form
*/
protected function valueForm(&$form, &$form_state)
{
if (empty($form_state['exposed'])) {
$form['value']['type'] = array('#type' => 'radios', '#title' => t('Value type'), '#options' => array('date' => t('A date in any machine readable format. CCYY-MM-DD HH:MM:SS is preferred.'), 'offset' => t('An offset from the current time such as "!example1" or "!example2"', array('!example1' => '+1 day', '!example2' => '-2 hours -30 minutes'))), '#default_value' => !empty($this->value['type']) ? $this->value['type'] : 'date');
}
parent::valueForm($form, $form_state);
}
