diff --git a/Dockerfile b/Dockerfile
index 715a280..51b2f99 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,7 @@
 FROM focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest-slim
 
+ENV TZ="Asia/Shanghai"
+
 RUN apt-get update && \
     apt-get install -y --no-install-recommends sudo python3-minimal python3-pip git openssh-client && \
     apt-get clean && \