--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/libcalendaring/lib/Sabre/VObject/Property/MultiDateTime.php	Sat Jan 13 08:57:56 2018 -0500
@@ -0,0 +1,180 @@
+<?php
+
+namespace Sabre\VObject\Property;
+
+use Sabre\VObject;
+
+/**
+ * Multi-DateTime property
+ *
+ * This element is used for iCalendar properties such as the EXDATE property.
+ * It basically provides a few helper functions that make it easier to deal
+ * with these. It supports both DATE-TIME and DATE values.
+ *
+ * In order to use this correctly, you must call setDateTimes and getDateTimes
+ * to retrieve and modify dates respectively.
+ *
+ * If you use the 'value' or properties directly, this object does not keep
+ * reference and results might appear incorrectly.
+ *
+ * @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 MultiDateTime extends VObject\Property {
+
+    /**
+     * DateTime representation
+     *
+     * @var DateTime[]
+     */
+    protected $dateTimes;
+
+    /**
+     * dateType
+     *
+     * This is one of the Sabre\VObject\Property\DateTime constants.
+     *
+     * @var int
+     */
+    protected $dateType;
+
+    /**
+     * Updates the value
+     *
+     * @param array $dt Must be an array of DateTime objects.
+     * @param int $dateType
+     * @return void
+     */
+    public function setDateTimes(array $dt, $dateType = VObject\Property\DateTime::LOCALTZ) {
+
+        foreach($dt as $i)
+            if (!$i instanceof \DateTime)
+                throw new \InvalidArgumentException('You must pass an array of DateTime objects');
+
+        $this->offsetUnset('VALUE');
+        $this->offsetUnset('TZID');
+        switch($dateType) {
+
+            case DateTime::LOCAL :
+                $val = array();
+                foreach($dt as $i) {
+                    $val[] = $i->format('Ymd\\THis');
+                }
+                $this->setValue(implode(',',$val));
+                $this->offsetSet('VALUE','DATE-TIME');
+                break;
+            case DateTime::UTC :
+                $val = array();
+                foreach($dt as $i) {
+                    $i->setTimeZone(new \DateTimeZone('UTC'));
+                    $val[] = $i->format('Ymd\\THis\\Z');
+                }
+                $this->setValue(implode(',',$val));
+                $this->offsetSet('VALUE','DATE-TIME');
+                break;
+            case DateTime::LOCALTZ :
+                $val = array();
+                foreach($dt as $i) {
+                    $val[] = $i->format('Ymd\\THis');
+                }
+                $this->setValue(implode(',',$val));
+                $this->offsetSet('VALUE','DATE-TIME');
+                $this->offsetSet('TZID', $dt[0]->getTimeZone()->getName());
+                break;
+            case DateTime::DATE :
+                $val = array();
+                foreach($dt as $i) {
+                    $val[] = $i->format('Ymd');
+                }
+                $this->setValue(implode(',',$val));
+                $this->offsetSet('VALUE','DATE');
+                break;
+            default :
+                throw new \InvalidArgumentException('You must pass a valid dateType constant');
+
+        }
+        $this->dateTimes = $dt;
+        $this->dateType = $dateType;
+
+    }
+
+    /**
+     * Returns the current DateTime value.
+     *
+     * If no value was set, this method returns null.
+     *
+     * @return array|null
+     */
+    public function getDateTimes() {
+
+        if ($this->dateTimes)
+            return $this->dateTimes;
+
+        $dts = array();
+
+        if (!$this->value) {
+            $this->dateTimes = null;
+            $this->dateType = null;
+            return null;
+        }
+
+        foreach(explode(',',$this->value) as $val) {
+            list(
+                $type,
+                $dt
+            ) = DateTime::parseData($val, $this);
+            $dts[] = $dt;
+            $this->dateType = $type;
+        }
+        $this->dateTimes = $dts;
+        return $this->dateTimes;
+
+    }
+
+    /**
+     * Returns the type of Date format.
+     *
+     * This method returns one of the format constants. If no date was set,
+     * this method will return null.
+     *
+     * @return int|null
+     */
+    public function getDateType() {
+
+        if ($this->dateType)
+            return $this->dateType;
+
+        if (!$this->value) {
+            $this->dateTimes = null;
+            $this->dateType = null;
+            return null;
+        }
+
+        $dts = array();
+        foreach(explode(',',$this->value) as $val) {
+            list(
+                $type,
+                $dt
+            ) = DateTime::parseData($val, $this);
+            $dts[] = $dt;
+            $this->dateType = $type;
+        }
+        $this->dateTimes = $dts;
+        return $this->dateType;
+
+    }
+
+    /**
+     * This method will return true, if the property had a date and a time, as
+     * opposed to only a date.
+     *
+     * @return bool
+     */
+    public function hasTime() {
+
+        return $this->getDateType()!==DateTime::DATE;
+
+    }
+
+}