Fix various compatibility issues with PHP 8

libs/ical/Property/DateTimesProperty.php

@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * This file is part of the eluceo/iCal package.
+ *
+ * (c) Markus Poerschke <markus@eluceo.de>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace Eluceo\iCal\Property;
+
+use Eluceo\iCal\Property;
+use Eluceo\iCal\Util\DateUtil;
+
+class DateTimesProperty extends Property
+{
+    /**
+     * @param string               $name
+     * @param \DateTimeInterface[] $dateTimes
+     * @param bool                 $noTime
+     * @param bool                 $useTimezone
+     * @param bool                 $useUtc
+     * @param string               $timezoneString
+     */
+    public function __construct(
+        $name,
+        $dateTimes = [],
+        $noTime = false,
+        $useTimezone = false,
+        $useUtc = false,
+        $timezoneString = ''
+    ) {
+        $dates = [];
+        $dateTime = new \DateTimeImmutable();
+        foreach ($dateTimes as $dateTime) {
+            $dates[] = DateUtil::getDateString($dateTime, $noTime, $useTimezone, $useUtc);
+        }
+
+        //@todo stop this triggering an E_NOTICE when $dateTimes is empty
+        $params = DateUtil::getDefaultParams($dateTime, $noTime, $useTimezone, $timezoneString);
+
+        parent::__construct($name, $dates, $params);
+    }
+}