#/usr/bin/perl -w
use strict; # always a good idea

my $newfile = '/perl/bin/newr';

# consider File::Find, if you'd like to be recursive
# also, always check the return value of opendir 
# (I suspect this may be the root of your problems)
opendir(DIR,$newfile) or die "Unable to opendir!";
my @files = readdir(DIR);
close(DIR);

foreach (@files) {
   print "File: $_\n";
   my($atime,$mtime) = (stat($_))[8,9];
   print "atime: " . localtime($atime) . "\n";
   print "mtime: " . localtime($mtime) . "\n";
}