diff --git a/system/configuration.nix b/system/configuration.nix
index 3ae55b7..6d6a85c 100644
--- a/system/configuration.nix
+++ b/system/configuration.nix
@@ -25,6 +25,7 @@
   networking.networkmanager.enable = true;
   # Set your time zone.
   time.timeZone = "America/Sao_Paulo";
+  environment.variables.TZ = config.time.timeZone;
   # Select internationalisation properties.
   i18n.defaultLocale = "pt_BR.utf8";