diff --git a/personal-cli/hm.nix b/personal-cli/hm.nix
index 9c63378..d5f1925 100644
--- a/personal-cli/hm.nix
+++ b/personal-cli/hm.nix
@@ -56,7 +56,10 @@ in {
     };
   };
 
-  programs.khal.enable = true;
+  programs.khal = {
+    locale.timeformat = "%H:%M";
+    enable = true;
+  };
   programs.vdirsyncer.enable = true;
   services.vdirsyncer.enable = true;