diff --git a/apps/dav/lib/CalDAV/CalDavBackend.php b/apps/dav/lib/CalDAV/CalDavBackend.php
index 47d701fdaa..3fcb97f98b 100644
--- a/apps/dav/lib/CalDAV/CalDavBackend.php
+++ b/apps/dav/lib/CalDAV/CalDavBackend.php
@@ -33,6 +33,7 @@
 
 namespace OCA\DAV\CalDAV;
 
+use DateTime;
 use OCA\DAV\DAV\Sharing\IShareable;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCA\DAV\Connector\Sabre\Principal;
@@ -445,7 +446,7 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 
 		return $this->userDisplayNames[$uid];
 	}
-	
+
 	/**
 	 * @return array
 	 */
@@ -1550,14 +1551,14 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 			->from('calendarobjects', 'c');
 
 		if (isset($options['timerange'])) {
-			if (isset($options['timerange']['start'])) {
+			if (isset($options['timerange']['start']) && $options['timerange']['start'] instanceof DateTime) {
 				$outerQuery->andWhere($outerQuery->expr()->gt('lastoccurence',
-					$outerQuery->createNamedParameter($options['timerange']['start']->getTimeStamp)));
+					$outerQuery->createNamedParameter($options['timerange']['start']->getTimeStamp())));
 
 			}
-			if (isset($options['timerange']['end'])) {
+			if (isset($options['timerange']['end']) && $options['timerange']['end'] instanceof DateTime) {
 				$outerQuery->andWhere($outerQuery->expr()->lt('firstoccurence',
-					$outerQuery->createNamedParameter($options['timerange']['end']->getTimeStamp)));
+					$outerQuery->createNamedParameter($options['timerange']['end']->getTimeStamp())));
 			}
 		}
 
@@ -2257,7 +2258,7 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 				}
 			} else {
 				$it = new EventIterator($vObject, (string)$component->UID);
-				$maxDate = new \DateTime(self::MAX_DATE);
+				$maxDate = new DateTime(self::MAX_DATE);
 				if ($it->isInfinite()) {
 					$lastOccurrence = $maxDate->getTimestamp();
 				} else {
diff --git a/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php b/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
index 1b2169b667..212b09f31f 100644
--- a/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
@@ -806,7 +806,7 @@ EOD;
 	/**
 	 * @dataProvider searchDataProvider
 	 */
-	public function testSearch($isShared, $count) {
+	public function testSearch(bool $isShared, array $searchOptions, int $count) {
 		$calendarId = $this->createTestCalendar();
 
 		$uris = [];
@@ -900,15 +900,16 @@ EOD;
 		];
 
 		$result = $this->backend->search($calendarInfo, 'Test',
-			['SUMMARY', 'LOCATION', 'ATTENDEE'], [], null, null);
+			['SUMMARY', 'LOCATION', 'ATTENDEE'], $searchOptions, null, null);
 
 		$this->assertCount($count, $result);
 	}
 
 	public function searchDataProvider() {
 		return [
-			[false, 4],
-			[true, 2],
+			[false, [], 4],
+			[true, ['timerange' => ['start' => new DateTime('2013-09-12 13:00:00'), 'end' => new DateTime('2013-09-12 14:00:00')]], 2],
+			[true, ['timerange' => ['start' => new DateTime('2013-09-12 15:00:00'), 'end' => new DateTime('2013-09-12 16:00:00')]], 0],
 		];
 	}