diff --git a/src/RRule.php b/src/RRule.php
index c5eb35d..d71e754 100644
--- a/src/RRule.php
+++ b/src/RRule.php
@@ -286,9 +286,7 @@ public function jsonSerialize(): array
 
         $start = $this->getStart();
         if ($start) {
-            $data['start'] = (clone $start)
-                ->setTimezone(new DateTimeZone('UTC'))
-                ->format(static::SERIALIZED_DATETIME_FORMAT);
+            $data['start'] = $start->format(static::SERIALIZED_DATETIME_FORMAT);
         }
 
         return $data;