/**
* Gets the difference of two date values in sfTime::MONTH
*
* @param $other mixed timestamp, string, or sfDate object
* @return int the difference in the unit
* @author Enrique Martinez <*****@*****.**>
**/
public function diffMonth($other)
{
$other_date = self::getInstance($other);
$years_diff = $this->diffYear($other_date);
$diff = 12 * $years_diff;
$date_compare = new sfDate($other_date);
$date_compare->addYear($years_diff);
if ($other_date->cmp($this) < 0) {
while ($date_compare->cmp($this) < 0) {
$date_compare = new sfDate($other_date);
$diff++;
$date_compare->addCalendarMonth($diff);
}
if ($date_compare->cmp($this) > 0) {
$diff--;
}
}
if ($other_date->cmp($this) > 0) {
while ($date_compare->cmp($this) > 0) {
$date_compare = new sfDate($other_date);
$diff--;
$date_compare->subtractCalendarMonth(abs($diff));
}
if ($date_compare->cmp($this) < 0) {
$diff++;
}
}
return $diff;
}
