From a5863e8dc49ea2791b26fd8dc1057b7467cedf41 Mon Sep 17 00:00:00 2001
From: Daniel Hofstetter <daniel.hofstetter@42dh.com>
Date: Mon, 14 Sep 2026 15:15:11 +0200
Subject: [PATCH] date: allow non-utf8 path for --reference

---
 src/uu/date/src/date.rs    |  8 +++++---
 tests/by-util/test_date.rs | 21 +++++++++++++++++++++
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/src/uu/date/src/date.rs b/src/uu/date/src/date.rs
index d4a23b19a2..74c03a56be 100644
--- a/src/uu/date/src/date.rs
+++ b/src/uu/date/src/date.rs
@@ -15,6 +15,7 @@ use jiff::{Timestamp, Zoned};
 use parse_datetime::{ExtendedDateTime, ParsedDateTime};
 use std::borrow::Cow;
 use std::collections::HashMap;
+use std::ffi::OsString;
 use std::fs::File;
 use std::io::{BufRead, BufReader, BufWriter, Read, Write, stderr};
 use std::path::PathBuf;
@@ -343,7 +344,7 @@ fn parse_military_timezone_with_offset(s: &str) -> Option<(i32, DayDelta)> {
 pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     let matches = uucore::clap_localization::handle_clap_result(uu_app(), args)?;
 
-    let date_source = if let Some(date_os) = matches.get_one::<std::ffi::OsString>(OPT_DATE) {
+    let date_source = if let Some(date_os) = matches.get_one::<OsString>(OPT_DATE) {
         // Convert OsString to String, handling invalid UTF-8 with GNU-compatible error
         let date = date_os.to_str().ok_or_else(|| {
             let bytes = date_os.as_encoded_bytes();
@@ -356,7 +357,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
             "-" => DateSource::Stdin,
             _ => DateSource::File(file.into()),
         }
-    } else if let Some(file) = matches.get_one::<String>(OPT_REFERENCE) {
+    } else if let Some(file) = matches.get_one::<OsString>(OPT_REFERENCE) {
         DateSource::FileMtime(file.into())
     } else if matches.get_flag(OPT_RESOLUTION) {
         DateSource::Resolution
@@ -691,7 +692,7 @@ pub fn uu_app() -> Command {
                 .value_name("STRING")
                 .allow_hyphen_values(true)
                 .overrides_with(OPT_DATE)
-                .value_parser(clap::value_parser!(std::ffi::OsString))
+                .value_parser(clap::value_parser!(OsString))
                 .help(translate!("date-help-date")),
         )
         .arg(
@@ -752,6 +753,7 @@ pub fn uu_app() -> Command {
                 .long(OPT_REFERENCE)
                 .value_name("FILE")
                 .value_hint(clap::ValueHint::AnyPath)
+                .value_parser(clap::value_parser!(OsString))
                 .conflicts_with_all([OPT_DATE, OPT_FILE, OPT_RESOLUTION])
                 .overrides_with(OPT_REFERENCE)
                 .help(translate!("date-help-reference")),
diff --git a/tests/by-util/test_date.rs b/tests/by-util/test_date.rs
index 5f35c5d67b..b050f4d4f3 100644
--- a/tests/by-util/test_date.rs
+++ b/tests/by-util/test_date.rs
@@ -700,6 +700,27 @@ fn test_date_for_file_mtime() {
         .stdout_only("1234\n");
 }
 
+#[test]
+#[cfg(target_os = "linux")]
+#[cfg_attr(wasi_runner, ignore = "WASI: argv/filenames must be valid UTF-8")]
+fn test_date_reference_is_non_utf8_path() {
+    use std::os::unix::ffi::OsStrExt;
+    use std::time::{Duration, UNIX_EPOCH};
+
+    let (at, mut ucmd) = at_and_ucmd!();
+
+    let reference_file = std::ffi::OsStr::from_bytes(b"reference_\xFF\xFE.txt");
+    let f = std::fs::File::create(at.plus(reference_file)).unwrap();
+    let modification_date = UNIX_EPOCH.checked_add(Duration::from_secs(1234)).unwrap();
+    f.set_modified(modification_date).unwrap();
+
+    ucmd.arg("--reference")
+        .arg(reference_file)
+        .arg("+%s")
+        .succeeds()
+        .stdout_only("1234\n");
+}
+
 #[test]
 fn test_date_multiple_references() {
     use std::time::{Duration, UNIX_EPOCH};