diff --git a/pkgs/by-name/ho/howard-hinnant-date/make-zoneinfo-available.diff b/pkgs/by-name/ho/howard-hinnant-date/make-zoneinfo-available.diff
index f9e69ff38cbb..e9a0f006a6e8 100644
--- a/pkgs/by-name/ho/howard-hinnant-date/make-zoneinfo-available.diff
+++ b/pkgs/by-name/ho/howard-hinnant-date/make-zoneinfo-available.diff
@@ -1,11 +1,9 @@
-diff --git a/src/tz.cpp b/src/tz.cpp
-index 68436c3..2bfe19e 100644
 --- a/src/tz.cpp
 +++ b/src/tz.cpp
-@@ -349,7 +349,7 @@ discover_tz_dir()
-     struct stat sb;
-     using namespace std;
- #  ifndef __APPLE__
+@@ -498,7 +498,7 @@ discover_tz_dir()
+     else
+         throw runtime_error("discover_tz_dir failed to find zoneinfo\n");
+ #  elif !defined(__APPLE__)
 -    CONSTDATA auto tz_dir_default = "/usr/share/zoneinfo";
 +    CONSTDATA auto tz_dir_default = "@tzdata@/share/zoneinfo";
      CONSTDATA auto tz_dir_buildroot = "/usr/share/zoneinfo/uclibc";
diff --git a/pkgs/by-name/ho/howard-hinnant-date/package.nix b/pkgs/by-name/ho/howard-hinnant-date/package.nix
index 3f7210df56f7..0387bad95e0e 100644
--- a/pkgs/by-name/ho/howard-hinnant-date/package.nix
+++ b/pkgs/by-name/ho/howard-hinnant-date/package.nix
@@ -2,13 +2,13 @@
 
 stdenv.mkDerivation rec {
   pname = "howard-hinnant-date";
-  version = "3.0.1";
+  version = "3.0.3";
 
   src = fetchFromGitHub {
     owner = "HowardHinnant";
     repo = "date";
     rev = "v${version}";
-    sha256 = "1qk7pgnk0bpinja28104qha6f7r1xwh5dy3gra7vjkqwl0jdwa35";
+    hash = "sha256-qfrmH3NRyrDVmHRmmWzM5Zz37E7RFXJqaV1Rq2E59qs=";
   };
 
   patches = [
@@ -19,13 +19,6 @@ stdenv.mkDerivation rec {
       url = "https://git.alpinelinux.org/aports/plain/community/date/538-output-date-pc-for-pkg-config.patch?id=11f6b4d4206b0648182e7b41cd57dcc9ccea0728";
       sha256 = "1ma0586jsd89jgwbmd2qlvlc8pshs1pc4zk5drgxi3qvp8ai1154";
     })
-    # Fix CMake include directory path.
-    # https://github.com/HowardHinnant/date/pull/753
-    (fetchpatch {
-      name = "fix-cmake-include-dir.patch";
-      url = "https://github.com/HowardHinnant/date/commit/8061b53c489b0c8676feedcb65049b27664327b5.patch";
-      hash = "sha256-weZUgu0SDad7EK7msUbVzk1zY4euI0Biafj/5jD4JV4=";
-    })
     # Without this patch, this library will drop a `tzdata` directory into
     # `~/Downloads` if it cannot find `/usr/share/zoneinfo`. Make the path it
     # searches for `zoneinfo` be the one from the `tzdata` package.
@@ -33,13 +26,6 @@ stdenv.mkDerivation rec {
       src = ./make-zoneinfo-available.diff;
       inherit tzdata;
     })
-    # The reported version to cmake's find_package() is 3.0.0, but the actual
-    # version is 3.0.1. This patch fixes that.
-    (fetchpatch {
-      name = "fix-cmake-version.patch";
-      url = "https://github.com/HowardHinnant/date/commit/2e19c006e2218447ee31f864191859517603f59f.patch";
-      hash = "sha256-SRAWrwv64ap3Qh3RlhwqgS0L2YsrjqVSgw6iH3KlWvk=";
-    })
   ];
 
   # Tweaks to fix undefined variable substitutions