diff --git a/system/motd.nix b/system/motd.nix
index 29e7cd1..6639a5a 100644
--- a/system/motd.nix
+++ b/system/motd.nix
@@ -12,7 +12,7 @@ let
   # lastModifiedDate is in format "YYYYMMDDHHMMSS"
   dateStr = self.sourceInfo.lastModifiedDate or "unknown";
   formattedDate = if dateStr != "unknown" then
-    "${builtins.substring 0 4 dateStr}-${builtins.substring 4 2 dateStr}-${builtins.substring 6 2 dateStr} ${builtins.substring 8 2 dateStr}:${builtins.substring 10 2 dateStr}"
+    "${builtins.substring 0 4 dateStr}-${builtins.substring 4 2 dateStr}-${builtins.substring 6 2 dateStr} ${builtins.substring 8 2 dateStr}:${builtins.substring 10 2 dateStr} UTC"
   else
     "unknown";