Fix touch panics when using invalid timestamp (#6181)

Signed-off-by: nibon7 <nibon7@163.com>

crates/nu-command/tests/commands/touch.rs

@@ -766,3 +766,20 @@ fn not_create_file_if_it_not_exists() {
         assert!(!path.exists());
     })
 }
+
+#[test]
+fn test_invalid_timestamp() {
+    Playground::setup("test_invalid_timestamp", |dirs, _sandbox| {
+        let outcome = nu!(
+            cwd: dirs.test(),
+            r#"touch -t 20220729. file.txt"#
+        );
+        assert!(outcome.err.contains("input has an invalid timestamp"));
+
+        let outcome = nu!(
+            cwd: dirs.test(),
+            r#"touch -t 20220729120099 file.txt"#
+        );
+        assert!(outcome.err.contains("input has an invalid timestamp"));
+    })
+}