La solucion
function khronos_update_instance($khronos) {
$khronos->timemodified = time();
$khronos->id = $khronos->instance;
# You may have to add extra stuff in here #
$khronos->mintimeperiod = khronos_translate_to_seconds($khronos->mintimeperiod);
$khronos->maxtimeperiod = khronos_translate_to_seconds($khronos->maxtimeperiod);
$khronos->autooff = khronos_translate_to_seconds($khronos->autooff);
$khronos->overlimitperiod = khronos_translate_to_seconds($khronos->overlimitperiod);
$khronos->maxperiodedit = khronos_translate_to_seconds($khronos->maxperiodedit);
$labels = new Object();
$labels->khronosid = $khronos->id;
$labels->label = $khronos->labels;
//TAGS
if($labels->label and !record_exists('khronos_labels', 'khronosid', $khronos->id, 'label', $labels->label)){
insert_record('khronos_labels', $labels);
}
return update_record('khronos', $khronos);
}