diff --git a/system/system.nix b/system/system.nix
index c84503e..dc458a9 100644
--- a/system/system.nix
+++ b/system/system.nix
@@ -14,8 +14,8 @@
   ];
 
   # Set your time zone.
-  # time.timeZone = "America/New_York";
-  time.timeZone = "Asia/Seoul";
+  time.timeZone = "America/New_York";
+  # time.timeZone = "Asia/Seoul";
 
   # Select internationalisation properties.
   i18n.defaultLocale = "en_US.UTF-8";