diff --git a/pkgs/by-name/bi/biff/package.nix b/pkgs/by-name/bi/biff/package.nix
deleted file mode 100644
index 422d74d9c7cc..000000000000
--- a/pkgs/by-name/bi/biff/package.nix
+++ /dev/null
@@ -1,41 +0,0 @@
-{
-  lib,
-  fetchFromGitHub,
-  nix-update-script,
-  rustPlatform,
-  versionCheckHook,
-  withLocaleSupport ? true,
-}:
-rustPlatform.buildRustPackage (finalAttrs: {
-  pname = "biff";
-  version = "0.1.1";
-
-  src = fetchFromGitHub {
-    owner = "BurntSushi";
-    repo = "biff";
-    tag = finalAttrs.version;
-    hash = "sha256-7KkzmaWbUHrLUd7lADJLPLSeE/RYJvVAEL+FcE5KIhY=";
-  };
-
-  buildFeatures = lib.optional withLocaleSupport "locale";
-
-  cargoHash = "sha256-pGY1KDcsBz5J/mf4c8zDVbivgzfimSy8ruNoa+Pn9p8=";
-
-  doInstallCheck = true;
-  nativeInstallCheckInputs = [ versionCheckHook ];
-
-  passthru.updateScript = nix-update-script { };
-
-  meta = {
-    description = "Command line tool for datetime arithmetic, parsing, formatting and more";
-    homepage = "https://github.com/BurntSushi/biff";
-    changelog = "https://github.com/BurntSushi/biff/blob/${finalAttrs.version}/CHANGELOG.md";
-    license = [
-      lib.licenses.mit
-      lib.licenses.unlicense
-    ];
-    maintainers = [ lib.maintainers.kpbaks ];
-    mainProgram = "biff";
-    platforms = lib.platforms.all;
-  };
-})
diff --git a/pkgs/by-name/bt/bttf/package.nix b/pkgs/by-name/bt/bttf/package.nix
new file mode 100644
index 000000000000..94eb71eb8ec7
--- /dev/null
+++ b/pkgs/by-name/bt/bttf/package.nix
@@ -0,0 +1,39 @@
+{
+  lib,
+  rustPlatform,
+  fetchFromGitHub,
+  versionCheckHook,
+}:
+
+rustPlatform.buildRustPackage (finalAttrs: {
+  pname = "bttf";
+  version = "0.1.4";
+  __structuredAttrs = true;
+
+  src = fetchFromGitHub {
+    owner = "BurntSushi";
+    repo = "bttf";
+    tag = finalAttrs.version;
+    hash = "sha256-KB9ix/4UTNoxXAT+EuCtcjjFKurwPYrYBcx4H2ctv/E=";
+  };
+
+  cargoHash = "sha256-afmzxV+rN2Cw1cQltsml4Z6NsP3E5FEf/VY9RRWE+uc=";
+
+  nativeInstallCheckInputs = [ versionCheckHook ];
+  doInstallCheck = true;
+
+  meta = {
+    description = "Command line tool for datetime arithmetic, parsing, formatting and more. Replacment for biff";
+    homepage = "https://github.com/BurntSushi/bttf";
+    changelog = "https://github.com/BurntSushi/bttf/releases/tag/${finalAttrs.src.tag}";
+    license = with lib.licenses; [
+      mit
+      unlicense
+    ];
+    maintainers = with lib.maintainers; [
+      kpbaks
+      paepcke
+    ];
+    mainProgram = "bttf";
+  };
+})
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 2225120649c0..f63cb9db18ca 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -383,6 +383,7 @@ mapAliases {
   bencode = throw "'bencode' has been removed because it is unmaintained upstream"; # Added 2026-04-09
   bfc = throw "bfc has been removed, as it does not build with supported LLVM versions"; # Added 2025-08-10
   bfr = throw "bfr has been removed, did not update since 2004, fails to build on gcc-15, no homepage"; # Added 2026-01-28
+  biff = throw "biff has been renamed to/replaced by 'bttf'"; # Added 2026-06-04
   bindle = throw "bindle has been removed since it is vulnerable to CVE-2025-62518 and upstream has been archived"; # Added 2025-10-24
   binserve = throw "'binserve' has been removed because it is unmaintained upstream."; # Added 2025-11-29
   bitbucket-server-cli = throw "bitbucket-server-cli has been removed due to lack of maintenance upstream."; # Added 2025-05-27