Sabre\VObject\Recur\EventIterator::fastForward PHP Method

    public function fastForward(DateTime $dateTime)
    {
        while ($this->valid() && $this->getDtEnd() < $dateTime) {
            $this->next();
        }
    }

 /**
  * Returns true or false depending on if the event falls in the specified
  * time-range. This is used for filtering purposes.
  *
  * The rules used to determine if an event falls within the specified
  * time-range is based on the CalDAV specification.
  *
  * @param \DateTime $start
  * @param \DateTime $end
  * @return bool
  */
 public function isInTimeRange(\DateTime $start, \DateTime $end)
 {
     if ($this->RRULE) {
         $it = new EventIterator($this);
         $it->fastForward($start);
         // We fast-forwarded to a spot where the end-time of the
         // recurrence instance exceeded the start of the requested
         // time-range.
         //
         // If the starttime of the recurrence did not exceed the
         // end of the time range as well, we have a match.
         return $it->getDTStart() < $end && $it->getDTEnd() > $start;
     }
     $effectiveStart = $this->DTSTART->getDateTime();
     if (isset($this->DTEND)) {
         // The DTEND property is considered non inclusive. So for a 3 day
         // event in july, dtstart and dtend would have to be July 1st and
         // July 4th respectively.
         //
         // See:
         // http://tools.ietf.org/html/rfc5545#page-54
         $effectiveEnd = $this->DTEND->getDateTime();
     } elseif (isset($this->DURATION)) {
         $effectiveEnd = clone $effectiveStart;
         $effectiveEnd->add(VObject\DateTimeParser::parseDuration($this->DURATION));
     } elseif (!$this->DTSTART->hasTime()) {
         $effectiveEnd = clone $effectiveStart;
         $effectiveEnd->modify('+1 day');
     } else {
         $effectiveEnd = clone $effectiveStart;
     }
     return $start <= $effectiveEnd && $end > $effectiveStart;
 }