From 7edd045206b89f0a22b88ed0ae9336e361947eb0 Mon Sep 17 00:00:00 2001
From: Daniel Hofstetter <daniel.hofstetter@42dh.com>
Date: Thu, 16 Jan 2025 09:41:04 +0100
Subject: [PATCH] date: use UTC if TZ is empty

---
 src/uu/date/src/date.rs    | 2 +-
 tests/by-util/test_date.rs | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/uu/date/src/date.rs b/src/uu/date/src/date.rs
index 24aaf6967..f4d420c3f 100644
--- a/src/uu/date/src/date.rs
+++ b/src/uu/date/src/date.rs
@@ -277,7 +277,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
                     // TODO - Revisit when chrono 0.5 is released. https://github.com/chronotope/chrono/issues/970
                     let tz = match std::env::var("TZ") {
                         // TODO Support other time zones...
-                        Ok(s) if s == "UTC0" => Tz::Etc__UTC,
+                        Ok(s) if s == "UTC0" || s.is_empty() => Tz::Etc__UTC,
                         _ => match get_timezone() {
                             Ok(tz_str) => tz_str.parse().unwrap(),
                             Err(_) => Tz::Etc__UTC,
diff --git a/tests/by-util/test_date.rs b/tests/by-util/test_date.rs
index d0a9c09a2..ac16fe831 100644
--- a/tests/by-util/test_date.rs
+++ b/tests/by-util/test_date.rs
@@ -482,3 +482,12 @@ fn test_date_from_stdin() {
              Sat Apr 15 18:30:00 UTC 2023\n",
         );
 }
+
+#[test]
+fn test_date_empty_tz() {
+    new_ucmd!()
+        .env("TZ", "")
+        .arg("+%Z")
+        .succeeds()
+        .stdout_only("UTC\n");
+}