diff --git a/inc/RRule.php b/inc/RRule.php
index 0f55c1d6..9e058bad 100644
--- a/inc/RRule.php
+++ b/inc/RRule.php
@@ -410,9 +410,7 @@ class RepeatRuleDateTime extends DateTime {
   public function FloatOrUTC($return_floating_times = false) {
     $gmt = clone($this);
     if ( !$return_floating_times && isset($this->tzid) && $this->tzid != 'UTC' ) {
-      $dtz = parent::getTimezone();
-      $offset = 0 - $dtz->getOffset($gmt);
-      $gmt->modify( $offset . ' seconds' );
+      $gmt->setTimezone('UTC');
     }
     if ( $this->is_date ) return $gmt->format('Ymd');
     if ( $return_floating_times ) return $gmt->format('Ymd\THis');