Horde_Date::compareDateTime PHP Method

    public function compareDateTime($other)
    {
        if (!$other instanceof Horde_Date) {
            $other = new Horde_Date($other);
        }
        if ($diff = $this->compareDate($other)) {
            return $diff;
        }
        return $this->compareTime($other);
    }

 /**
  * Retrieve the busy times from this event within the given timeframe.  This
  * is trivial for non-recurring events but recurring events need to be
  * expanded.
  *
  * @param Horde_Date $startDate The start point.
  * @param Horde_Date $endDate   The end point.
  *
  * @return array The list of busy times (only the start times of the event).
  */
 public function getBusyTimes(Horde_Date $startDate, Horde_Date $endDate)
 {
     if (!$this->recurs()) {
         if ($startDate->compareDateTime($this->_start) > 0 || $endDate->compareDateTime($this->_start) < 0) {
             return array();
         }
         return array($this->_start->timestamp());
     } else {
         $result = array();
         $next = $this->_recurrence->nextRecurrence($startDate);
         while ($next) {
             if ($endDate->compareDateTime($next) < 0) {
                 break;
             }
             if (!$this->_recurrence->hasException($next->year, $next->month, $next->mday)) {
                 $result[] = $next->timestamp();
             }
             $next->mday++;
             $next = $this->_recurrence->nextRecurrence($next);
         }
         return $result;
     }
 }