From 6ee581e2eaa28219a91c5334a4b972346fa77da4 Mon Sep 17 00:00:00 2001
From: CrazyRoka <rokarostuk@gmail.com>
Date: Mon, 29 Dec 2025 17:01:17 +0000
Subject: [PATCH 1/2] date: add benchmark

---
 Cargo.lock                        |  2 +
 src/uu/date/Cargo.toml            |  9 ++++
 src/uu/date/benches/date_bench.rs | 76 +++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 src/uu/date/benches/date_bench.rs

diff --git a/Cargo.lock b/Cargo.lock
index 277321cd990..5889e6218a0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3188,10 +3188,12 @@ name = "uu_date"
 version = "0.5.0"
 dependencies = [
  "clap",
+ "codspeed-divan-compat",
  "fluent",
  "jiff",
  "nix",
  "parse_datetime",
+ "tempfile",
  "uucore",
  "windows-sys 0.61.2",
 ]
diff --git a/src/uu/date/Cargo.toml b/src/uu/date/Cargo.toml
index 431868b9175..9bff97696f0 100644
--- a/src/uu/date/Cargo.toml
+++ b/src/uu/date/Cargo.toml
@@ -41,3 +41,12 @@ windows-sys = { workspace = true, features = [
 [[bin]]
 name = "date"
 path = "src/main.rs"
+
+[dev-dependencies]
+divan = { workspace = true }
+tempfile = { workspace = true }
+uucore = { workspace = true, features = ["benchmark"] }
+
+[[bench]]
+name = "date_bench"
+harness = false
diff --git a/src/uu/date/benches/date_bench.rs b/src/uu/date/benches/date_bench.rs
new file mode 100644
index 00000000000..636f876c544
--- /dev/null
+++ b/src/uu/date/benches/date_bench.rs
@@ -0,0 +1,76 @@
+// This file is part of the uutils coreutils package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+
+use divan::{Bencher, black_box};
+use std::io::Write;
+use tempfile::NamedTempFile;
+use uu_date::uumain;
+use uucore::benchmark::run_util_function;
+
+/// Helper to create a temporary file containing N lines of date strings.
+fn setup_date_file(lines: usize, date_format: &str) -> NamedTempFile {
+    let mut file = NamedTempFile::new().unwrap();
+    for _ in 0..lines {
+        writeln!(file, "{date_format}").unwrap();
+    }
+    file
+}
+
+/// Benchmarks processing a file containing simple ISO dates.
+#[divan::bench(args = [100, 1_000, 10_000])]
+fn file_iso_dates(bencher: Bencher, count: usize) {
+    let file = setup_date_file(count, "2023-05-10 12:00:00");
+    let path = file.path().to_str().unwrap();
+
+    bencher.bench(|| {
+        black_box(run_util_function(uumain, &["-f", path]));
+    });
+}
+
+/// Benchmarks processing a file containing dates with Timezone abbreviations.
+#[divan::bench(args = [100, 1_000, 10_000])]
+fn file_tz_abbreviations(bencher: Bencher, count: usize) {
+    // "EST" triggers the abbreviation lookup and double-parsing logic
+    let file = setup_date_file(count, "2023-05-10 12:00:00 EST");
+    let path = file.path().to_str().unwrap();
+
+    bencher.bench(|| {
+        black_box(run_util_function(uumain, &["-f", path]));
+    });
+}
+
+/// Benchmarks formatting speed using a custom output format.
+#[divan::bench(args = [1_000])]
+fn file_custom_format(bencher: Bencher, count: usize) {
+    let file = setup_date_file(count, "2023-05-10 12:00:00");
+    let path = file.path().to_str().unwrap();
+
+    bencher.bench(|| {
+        black_box(run_util_function(uumain, &["-f", path, "+%A %d %B %Y"]));
+    });
+}
+
+/// Benchmarks the overhead of starting the utility for a single date (no file).
+#[divan::bench]
+fn single_date_now(bencher: Bencher) {
+    bencher.bench(|| {
+        black_box(run_util_function(uumain, &[]));
+    });
+}
+
+/// Benchmarks parsing a complex relative date string passed as an argument.
+#[divan::bench]
+fn complex_relative_date(bencher: Bencher) {
+    bencher.bench(|| {
+        black_box(run_util_function(
+            uumain,
+            &["--date=last friday 12:00 + 2 days"],
+        ));
+    });
+}
+
+fn main() {
+    divan::main();
+}

From 491bfa9b9f93c7216afdeca59b8e7ff3d8720b17 Mon Sep 17 00:00:00 2001
From: CrazyRoka <rokarostuk@gmail.com>
Date: Mon, 29 Dec 2025 17:23:13 +0000
Subject: [PATCH 2/2] date: register benchmark in github actions list

---
 .github/workflows/benchmarks.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/workflows/benchmarks.yml b/.github/workflows/benchmarks.yml
index 205f6c1a24e..3561a4d15ea 100644
--- a/.github/workflows/benchmarks.yml
+++ b/.github/workflows/benchmarks.yml
@@ -45,6 +45,7 @@ jobs:
           - { package: uu_uniq }
           - { package: uu_wc }
           - { package: uu_factor }
+          - { package: uu_date }
     steps:
       - uses: actions/checkout@v6
         with: