public function to_json($load)
{
$field_data = parent::to_json($load);
$field_data = array_merge($field_data, array('timepicker_type' => $this->timepicker_type, 'time_format' => $this->get_time_format(), 'interval_step' => $this->get_interval_step(), 'restraints' => $this->get_restraints(), 'timepicker_options' => $this->get_timepicker_options()));
return $field_data;
}