Fix waybar clock locale.

fix-waybar.patch

@@ -0,0 +1,13 @@
+diff --git a/src/modules/clock.cpp b/src/modules/clock.cpp
+index f313606..daa0f6a 100644
+--- a/src/modules/clock.cpp
++++ b/src/modules/clock.cpp
+@@ -46,7 +46,7 @@ auto waybar::modules::Clock::update() -> void {
+                        date::make_zoned(time_zone_, date::floor<std::chrono::seconds>(now))};
+ 
+   std::string text;
+-  if (!fixed_time_zone_) {
++  if (false && !fixed_time_zone_) {
+     // As date dep is not fully compatible, prefer fmt
+     tzset();
+     auto localtime = fmt::localtime(std::chrono::system_clock::to_time_t(now));

sway.nix

@@ -7,7 +7,11 @@
 
   environment.systemPackages = with pkgs; with gnome3; [
     i3status
-    (waybar.override { pulseSupport = true; })
+    ((waybar.override { pulseSupport = true; }).overrideDerivation (_: {
+      patches = [
+        ./fix-waybar.patch
+      ];
+    }))
     wofi
     ydotool
     wl-clipboard