diff --git a/apps/dav/lib/Files/FileSearchBackend.php b/apps/dav/lib/Files/FileSearchBackend.php
index 9616d21b8879f..17a4c2b139420 100644
--- a/apps/dav/lib/Files/FileSearchBackend.php
+++ b/apps/dav/lib/Files/FileSearchBackend.php
@@ -270,7 +270,7 @@ private function castValue($propertyName, $value) {
 						return 0 + $value;
 					case SearchPropertyDefinition::DATATYPE_DATETIME:
 						if (is_numeric($value)) {
-							return 0 + $value;
+							return max(0, 0 + $value);
 						}
 						$date = \DateTime::createFromFormat(\DateTime::ATOM, $value);
 						return ($date instanceof \DateTime) ? $date->getTimestamp() : 0;