diff --git a/lib/Api/DefaultApi.php b/lib/Api/DefaultApi.php
index e3c71fe..04e720f 100644
--- a/lib/Api/DefaultApi.php
+++ b/lib/Api/DefaultApi.php
@@ -11202,7 +11202,7 @@ public function investmentThemesRequest($theme)
      */
     public function ipoCalendar($from, $to)
     {
-        list($response) = $this->ipoCalendarWithHttpInfo($from, $to);
+        list($response) = $this->ipoCalendarWithHttpInfo($from->format('Y-m-d'), $to->format('Y-m-d'));
         return $response;
     }