diff --git a/ci-root.nix b/ci-root.nix
index 280acecc0f..49751b2029 100644
--- a/ci-root.nix
+++ b/ci-root.nix
@@ -12,7 +12,7 @@ let
   ciBits = rec {
     x86_64-linux = {
       machine = depot.ops.nixos.systems;
-      pkgs = builtins.removeAttrs depot.nix.pkgs [ "grafana-plugins" "windows" "unifiHacked" ];
+      pkgs = builtins.removeAttrs depot.nix.pkgs [ "grafana-plugins" "windows" "unifiHacked" "nixpkgs-mozilla" "nightlyRust" "nightlyRustPlatform" ];
       pkg-grafana-plugins = depot.nix.pkgs.grafana-plugins;
       web = lib.filterAttrs (n: v: !lib.isFunction v) depot.web;
       other = {
diff --git a/nix/pkgs/datez/Cargo.lock b/nix/pkgs/datez/Cargo.lock
new file mode 100644
index 0000000000..f244e23e35
--- /dev/null
+++ b/nix/pkgs/datez/Cargo.lock
@@ -0,0 +1,377 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "anyhow"
+version = "1.0.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee10e43ae4a853c0a3591d4e2ada1719e553be18199d9da9d4a83f5927c2f5c7"
+
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "chrono"
+version = "0.4.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "670ad68c9088c2a963aaa298cb369688cf3f9465ce5e2d4ca10e6e0098a1ce73"
+dependencies = [
+ "libc",
+ "num-integer",
+ "num-traits",
+ "time",
+ "winapi",
+]
+
+[[package]]
+name = "chrono-tz"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64c01c1c607d25c71bbaa67c113d6c6b36c434744b4fd66691d711b5b1bc0c8b"
+dependencies = [
+ "chrono",
+ "chrono-tz-build",
+ "phf",
+]
+
+[[package]]
+name = "chrono-tz-build"
+version = "0.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db058d493fb2f65f41861bfed7e3fe6335264a9f0f92710cab5bdf01fef09069"
+dependencies = [
+ "parse-zoneinfo",
+ "phf",
+ "phf_codegen",
+]
+
+[[package]]
+name = "datez"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "chrono",
+ "chrono-tz",
+ "rstest",
+ "windows",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fcd999463524c52659517fe2cea98493cfe485d10565e7b0fb07dbba7ad2753"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.107"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fbe5e23404da5b4f555ef85ebed98fb4083e55a00c317800bc2a50ede9f3d219"
+
+[[package]]
+name = "num-integer"
+version = "0.1.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "parse-zoneinfo"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c705f256449c60da65e11ff6626e0c16a0a0b96aaa348de61376b249bc340f41"
+dependencies = [
+ "regex",
+]
+
+[[package]]
+name = "phf"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9fc3db1018c4b59d7d582a739436478b6035138b6aecbce989fc91c3e98409f"
+dependencies = [
+ "phf_shared",
+]
+
+[[package]]
+name = "phf_codegen"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fb1c3a8bc4dd4e5cfce29b44ffc14bedd2ee294559a294e2a4d4c9e9a6a13cd"
+dependencies = [
+ "phf_generator",
+ "phf_shared",
+]
+
+[[package]]
+name = "phf_generator"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d5285893bb5eb82e6aaf5d59ee909a06a16737a8970984dd7746ba9283498d6"
+dependencies = [
+ "phf_shared",
+ "rand",
+]
+
+[[package]]
+name = "phf_shared"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6796ad771acdc0123d2a88dc428b5e38ef24456743ddb1744ed628f9815c096"
+dependencies = [
+ "siphasher",
+ "uncased",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed0cfbc8191465bed66e1718596ee0b0b35d5ee1f41c5df2189d0fe8bde535ba"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba508cc11742c0dc5c1659771673afbab7a0efab23aa17e854cbab0837ed0b43"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38bc8cc6a5f2e3655e0899c1b848643b2562f853f114bfec7be120678e3ace05"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e7573632e6454cf6b99d7aac4ccca54be06da05aca2ef7423d22d27d4d4bcd8"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+ "rand_hc",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d34f1408f55294453790c48b2f1ebbb1c5b4b7563eb1f418bcfcfdbb06ebb4e7"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "rand_hc"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d51e9f596de227fda2ea6c84607f5558e196eeaf43c986b724ba4fb8fdf497e7"
+dependencies = [
+ "rand_core",
+]
+
+[[package]]
+name = "regex"
+version = "1.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461"
+dependencies = [
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
+
+[[package]]
+name = "rstest"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2288c66aeafe3b2ed227c981f364f9968fa952ef0b30e84ada4486e7ee24d00a"
+dependencies = [
+ "cfg-if",
+ "proc-macro2",
+ "quote",
+ "rustc_version",
+ "syn",
+]
+
+[[package]]
+name = "rustc_version"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "semver"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "568a8e6258aa33c13358f81fd834adb854c6f7c9468520910a9b1e8fac068012"
+
+[[package]]
+name = "siphasher"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "533494a8f9b724d33625ab53c6c4800f7cc445895924a8ef649222dcb76e938b"
+
+[[package]]
+name = "syn"
+version = "1.0.81"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2afee18b8beb5a596ecb4a2dce128c719b4ba399d34126b9e4396e3f9860966"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "time"
+version = "0.1.43"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "uncased"
+version = "0.9.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5baeed7327e25054889b9bd4f975f32e5f4c5d434042d59ab6cd4142c0a76ed0"
+dependencies = [
+ "version_check",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
+
+[[package]]
+name = "version_check"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
+
+[[package]]
+name = "wasi"
+version = "0.10.2+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e46c474738425c090573ecf5472d54ee5f78132e6195d0bbfcc2aabc0ed29f37"
+dependencies = [
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3022d174000fcaeb6f95933fb04171ea0e21b9289ac57fe4400bfa148e41df79"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "03b1584eebf06654708eab4301152032c13c1e47f4a754ffc93c733f10993e85"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f49df16591e9ad429997ec57d462b0cc45168f639d03489e8c2e933ea9c389d7"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2cb06177184100374f97d5e7261ee0b6adefa8ee32e38f87518ca22b519bb80e"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3c27bcbb33ddbed3569e36c14775c99f72b97c72ce49f81d128637fb48a061f"
diff --git a/nix/pkgs/datez/default.nix b/nix/pkgs/datez/default.nix
new file mode 100644
index 0000000000..86de2146d1
--- /dev/null
+++ b/nix/pkgs/datez/default.nix
@@ -0,0 +1,24 @@
+{ lib, fetchFromGitHub, rustPlatform }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "datez";
+  version = "0.1.0";
+
+  src = fetchFromGitHub {
+    owner = "fanf2";
+    repo = pname;
+    rev = "${pname}-${version}";
+    sha256 = "sha256:128aiaffrp39r380wqqwqp3x93pdrwdmj6kf010lyjfyxa2a6i0z";
+  };
+
+  cargoLock.lockFile = ./Cargo.lock;
+  postPatch = ''
+    cp ${./Cargo.lock} Cargo.lock
+  '';
+
+  meta = with lib; {
+    description = "Convert a time into several timezones";
+    homepage = "https://github.com/fanf2/datez";
+    license = licenses.cc0;
+  };
+}
diff --git a/nix/pkgs/default.nix b/nix/pkgs/default.nix
index cda0512dbe..1770b635f6 100644
--- a/nix/pkgs/default.nix
+++ b/nix/pkgs/default.nix
@@ -34,5 +34,15 @@
   netbox = pkgs.python3Packages.callPackage ./netbox {};
   prometheus-bird-exporter-lfty = pkgs.callPackage ./prometheus-bird-exporter-lfty.nix {};
   eapol-test = pkgs.callPackage ./eapol-test.nix {};
+  datez = pkgs.callPackage ./datez {
+    rustPlatform = depot.pkgs.nightlyRustPlatform;
+  };
+
+  nixpkgs-mozilla = pkgs.callPackages ./nixpkgs-mozilla {};
+  nightlyRust = depot.pkgs.nixpkgs-mozilla.latest.rustChannels.nightly;
+  nightlyRustPlatform = pkgs.makeRustPlatform {
+    rustc = depot.pkgs.nightlyRust.rust;
+    inherit (depot.pkgs.nightlyRust) cargo;
+  };
 } // (import ./heptapod-runner.nix args)
   // (import ./lightspeed args)
diff --git a/nix/pkgs/nixpkgs-mozilla/default.nix b/nix/pkgs/nixpkgs-mozilla/default.nix
new file mode 100644
index 0000000000..46d98bfe48
--- /dev/null
+++ b/nix/pkgs/nixpkgs-mozilla/default.nix
@@ -0,0 +1,11 @@
+{ pkgs, fetchFromGitHub }:
+
+let
+  nixpkgs-mozilla = fetchFromGitHub {
+    owner = "mozilla";
+    repo = "nixpkgs-mozilla";
+    rev = "764ed9c9721f66c945d77d7b09fb8c1879ec67c6";
+    sha256 = "sha256:0lkhaz4hciisvfhq8v2wlp019v6gg5vd4sf5vx3cj4d5b2zf0h4v";
+  };
+in
+  (import "${nixpkgs-mozilla}/package-set.nix" { inherit pkgs; })
diff --git a/ops/nixos/lib/home-manager/client.nix b/ops/nixos/lib/home-manager/client.nix
index b408138b0c..87791e33da 100644
--- a/ops/nixos/lib/home-manager/client.nix
+++ b/ops/nixos/lib/home-manager/client.nix
@@ -38,6 +38,7 @@ in
   '';
 
   home.packages = lib.mkAfter (with pkgs; ([
+    depot.nix.pkgs.datez
     go
     gopls
     goimports