or download this
$ perl -MPath::Tiny -le " print scalar gmtime( path( shift )->stat->mt
+ime ) " .
Mon Sep 14 09:38:52 2015
...
$ perl -MFile::stat -le " print scalar gmtime( stat( shift )->mtime )
+" NUL
Can't call method "mtime" on an undefined value at -e line 1.