/**
  * get count of days between dates, ignores time values
  *
  * @param Zend_Date $date
  * @return int
  */
 public function getDaysBetween(Zend_Date $date)
 {
     // 86400 seconds/day = 24 hours/day * 60 minutes/hour * 60 seconds/minute
     // rounding takes care of time changes
     return round($date->getDayStart()->sub($this->getDayStart())->toValue() / 8640);
 }