Only in 3.0.3/ lmt.1
diff -urP 3.0.3/ 3.0.8/
--- 3.0.3/	Thu Jan  1 02:00:00 1970
+++ 3.0.8/	Sat Sep  5 20:19:52 2020
@@ -0,0 +1,55 @@
+.Dd Sep 4, 2020
+.Dt lmt
+.Nm lmt
+.Nd last modification time
+.Nm lmt
+.Op Fl f Ar format
+.Ar file ...
+utility prints the last modification time for the given
+.Ar file
+to standard output.
+The information displayed is obtained by calling
+.Xr lstat 2
+with the given
+argument and evaluating the returned structure.
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl f Ar format
+The format in which to display the time.
+The format string may contain any of the conversion specifications
+described in the
+.Xr strftime 3
+manual page, as well as any arbitrary text.
+A newline
+.Pq Ql \en
+character is always output after the characters specified by
+the format string.
+The format string for the default display is:
+.Bd -literal -offset indent
+%a %b %e %H:%M:%S %Z %Y
+.Ex -std
+Print last modification time for
+.Pa file1
+to standard output:
+.Dl $ lmt file1
+Print last modification time for
+.Pa file1
+to standard output in ISO 8601 format:
+.Dl $ lmt -f "%Y-%m-%dT%H:%M:%S%z" file1
+.Xr stat 1
+.Xr strftime 3
diff -urP 3.0.3/ 3.0.8/
--- 3.0.3/	Tue Sep  8 22:18:43 2020
+++ 3.0.8/	Sat Sep  5 20:19:49 2020
@@ -6,7 +6,7 @@
 	<loc>$1/$(basename "$f")</loc>
-	<lastmod>$(lmt -f '%Y-%m-%dT%H:%M:%SZ' "$f" | cut -d' ' -f1)</lastmod>
+	<lastmod>$(stat -f '%Sm' -t '%Y-%m-%dT%H:%M:%SZ' "$f")</lastmod>