--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/libcalendaring/lib/Sabre/VObject/Component/VEvent.php	Sat Jan 13 08:57:56 2018 -0500
@@ -0,0 +1,70 @@
+<?php
+
+namespace Sabre\VObject\Component;
+use Sabre\VObject;
+
+/**
+ * VEvent component
+ *
+ * This component contains some additional functionality specific for VEVENT's.
+ *
+ * @copyright Copyright (C) 2007-2013 fruux GmbH (https://fruux.com/).
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://code.google.com/p/sabredav/wiki/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)
+        );
+
+    }
+
+}