diff --git a/joint_teapot/workers/gitea.py b/joint_teapot/workers/gitea.py
index 2732662..eced7d5 100644
--- a/joint_teapot/workers/gitea.py
+++ b/joint_teapot/workers/gitea.py
@@ -421,7 +421,7 @@ class Gitea:
             body={
                 "title": title,
                 "description": description,
-                "due_on": due_on + "T23:59:59.999Z",
+                "due_on": due_on + "T23:59:59.999+08:00",
             },
         )