diff --git a/pkgs/applications/misc/waybar/default.nix b/pkgs/applications/misc/waybar/default.nix
index 212013fb655d7..69d6ff8426823 100644
--- a/pkgs/applications/misc/waybar/default.nix
+++ b/pkgs/applications/misc/waybar/default.nix
@@ -1,5 +1,6 @@
 { stdenv, fetchFromGitHub, meson, pkgconfig, ninja, wrapGAppsHook
 , wayland, wlroots, gtkmm3, libinput, libsigcxx, jsoncpp, fmt, scdoc, spdlog, gtk-layer-shell
+, howard-hinnant-date, cmake
 , traySupport  ? true,  libdbusmenu-gtk3
 , pulseSupport ? false, libpulseaudio
 , nlSupport    ? true,  libnl
@@ -9,21 +10,21 @@
 }:
   stdenv.mkDerivation rec {
     pname = "waybar";
-    version = "0.9.0";
+    version = "0.9.1";
 
     src = fetchFromGitHub {
       owner = "Alexays";
       repo = "Waybar";
       rev = version;
-      sha256 = "1w8a6jih872ry288k8ic6mjfi9ccf1jwc24wnh9p5c7w73247c2c";
+      sha256 = "0drlv8im5phz39jxp3gxkc40b6f85bb3piff2v3hmnfzh7ib915s";
     };
 
     nativeBuildInputs = [
-      meson ninja pkgconfig scdoc wrapGAppsHook
+      meson ninja pkgconfig scdoc wrapGAppsHook cmake
     ];
 
     buildInputs = with stdenv.lib;
-      [ wayland wlroots gtkmm3 libinput libsigcxx jsoncpp fmt spdlog gtk-layer-shell ]
+      [ wayland wlroots gtkmm3 libinput libsigcxx jsoncpp fmt spdlog gtk-layer-shell howard-hinnant-date ]
       ++ optional  traySupport  libdbusmenu-gtk3
       ++ optional  pulseSupport libpulseaudio
       ++ optional  nlSupport    libnl
@@ -50,5 +51,6 @@
       license = licenses.mit;
       maintainers = with maintainers; [ FlorianFranzen minijackson synthetica ];
       platforms = platforms.unix;
+      homepage = "https://github.com/alexays/waybar";
     };
   }
diff --git a/pkgs/development/libraries/howard-hinnant-date/default.nix b/pkgs/development/libraries/howard-hinnant-date/default.nix
new file mode 100644
index 0000000000000..30e5c92b8f09f
--- /dev/null
+++ b/pkgs/development/libraries/howard-hinnant-date/default.nix
@@ -0,0 +1,38 @@
+{ stdenv, fetchFromGitHub, cmake, curl, fetchpatch }:
+
+stdenv.mkDerivation rec {
+  pname = "howard-hinnant-date-unstable";
+  version = "2020-01-24";
+
+  src = fetchFromGitHub {
+    owner = "HowardHinnant";
+    repo = "date";
+    rev = "9a0ee2542848ab8625984fc8cdbfb9b5414c0082";
+    sha256 = "0yxsn0hj22n61bjywysxqgfv7hj5xvsl6isma95fl8xrimpny083";
+  };
+
+  patches = [
+    (fetchpatch {
+      url = "https://github.com/HowardHinnant/date/commit/e56b2dce7e89a92e1b9b35caa13b3e938c4cedea.patch";
+      sha256 = "0m3qbhq7kmm9qa3jm6d2px7c1dxdj5k9lffgdvqnrwmhxwj1p9n2";
+    })
+  ];
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ curl ];
+
+  cmakeFlags = [
+    "-DBUILD_TZ_LIB=true"
+    "-DBUILD_SHARED_LIBS=true"
+  ];
+
+  outputs = [ "out" "dev" ];
+
+  meta = with stdenv.lib; {
+    license = licenses.mit;
+    description = "A date and time library based on the C++11/14/17 <chrono> header";
+    homepage = "https://github.com/HowardHinnant/date";
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ ma27 ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 844036d83e5f5..b70c6856301ac 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1562,6 +1562,8 @@ in
 
   datasette = with python3Packages; toPythonApplication datasette;
 
+  howard-hinnant-date = callPackage ../development/libraries/howard-hinnant-date { };
+
   datefudge = callPackage ../tools/system/datefudge { };
 
   dateutils = callPackage ../tools/misc/dateutils { };