diff --git a/lib/org/openpsa/sales/salesproject/deliverable.php b/lib/org/openpsa/sales/salesproject/deliverable.php
index def987d1b..1b4b107af 100644
--- a/lib/org/openpsa/sales/salesproject/deliverable.php
+++ b/lib/org/openpsa/sales/salesproject/deliverable.php
@@ -211,7 +211,8 @@ public function run_cycle() : bool
 
     public function get_cycle_identifier(int $time) : string
     {
-        $date = new DateTime('@' . $time, new DateTimeZone(date_default_timezone_get()));
+        $date = new DateTime('@' . $time);
+        $date->setTimezone(new DateTimeZone(date_default_timezone_get()));
 
         switch ($this->unit) {
             case 'm':