diff --git a/PostgreSQL/time.sql b/PostgreSQL/time.sql
new file mode 100644
index 0000000..a7ee605
--- /dev/null
+++ b/PostgreSQL/time.sql
@@ -0,0 +1,10 @@
+-- 设置会话时区
+SET TIME ZONE 'Asia/Shanghai';
+
+-- msg_time 是 timestamptz类型
+select msg_time from msg where id = 1;
+select msg_time AT TIME ZONE 'Asia/Shanghai' from msg where id = 1;
+select msg_time AT TIME ZONE 'UTC+8' from msg where id = 1;
+
+SELECT to_timestamp(1761850339);
+SELECT to_timestamp(1761850339) AT TIME ZONE 'Asia/Shanghai';