From 84affa2137feecedc997b5b865bb5690705f1599 Mon Sep 17 00:00:00 2001
From: Michael Debertol <michael.debertol@gmail.com>
Date: Tue, 15 Jun 2021 21:52:47 +0200
Subject: [PATCH] touch: support `@<timestamp>` date format

parse `@<seconds since epoch>` as a valid date.
---
 src/uu/touch/src/touch.rs   |  4 ++++
 tests/by-util/test_touch.rs | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/uu/touch/src/touch.rs b/src/uu/touch/src/touch.rs
index efa436c81..2e1c3c8e8 100644
--- a/src/uu/touch/src/touch.rs
+++ b/src/uu/touch/src/touch.rs
@@ -268,6 +268,10 @@ fn parse_date(str: &str) -> FileTime {
             return local_tm_to_filetime(to_local(tm));
         }
     }
+    if let Ok(tm) = time::strptime(str, "@%s") {
+        // Don't convert to local time in this case - seconds since epoch are not time-zone dependent
+        return local_tm_to_filetime(tm);
+    }
     show_error!("Unable to parse date: {}\n", str);
     process::exit(1);
 }
diff --git a/tests/by-util/test_touch.rs b/tests/by-util/test_touch.rs
index 5e8114092..3ed7f3bb2 100644
--- a/tests/by-util/test_touch.rs
+++ b/tests/by-util/test_touch.rs
@@ -375,6 +375,24 @@ fn test_touch_set_date2() {
     assert_eq!(mtime, start_of_year);
 }
 
+#[test]
+fn test_touch_set_date3() {
+    let (at, mut ucmd) = at_and_ucmd!();
+    let file = "test_touch_set_date";
+
+    ucmd.args(&["-d", "@1623786360", file])
+        .succeeds()
+        .no_stderr();
+
+    assert!(at.file_exists(file));
+
+    let expected = FileTime::from_unix_time(1623786360, 0);
+    let (atime, mtime) = get_file_times(&at, file);
+    assert_eq!(atime, mtime);
+    assert_eq!(atime, expected);
+    assert_eq!(mtime, expected);
+}
+
 #[test]
 fn test_touch_set_date_wrong_format() {
     let (_at, mut ucmd) = at_and_ucmd!();