function auto_convert($integer, $format, $toFormat)
{
$this->_set_params($integer, $format, $toFormat);
$iterate = $this->get_key($this->format) - $this->get_key($this->toFormat);
if ($iterate < 0) {
$iterate = $iterate * -1;
}
//turn to positive
$operator = $this->get_operator();
return calc::compute($this->integer, $operator, $iterate);
}
