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diff --git a/libcalendaring/lib/OldSabre/VObject/Component/VEvent.php b/libcalendaring/lib/OldSabre/VObject/Component/VEvent.php
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+<?php
+
+namespace OldSabre\VObject\Component;
+use OldSabre\VObject;
+
+/**
+ * VEvent component
+ *
+ * This component contains some additional functionality specific for VEVENT's.
+ *
+ * @copyright Copyright (C) 2011-2015 fruux GmbH (https://fruux.com/).
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class VEvent extends VObject\Component {
+
+ /**
+ * 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) {
+ $it = new VObject\RecurrenceIterator($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->getDateType() == VObject\Property\DateTime::DATE) {
+ $effectiveEnd = clone $effectiveStart;
+ $effectiveEnd->modify('+1 day');
+ } else {
+ $effectiveEnd = clone $effectiveStart;
+ }
+ return (
+ ($start <= $effectiveEnd) && ($end > $effectiveStart)
+ );
+
+ }
+
+}

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