use strict;
use warnings;

my $max = 0;
my ( $time, $oldest );
opendir ( my $d, '.' ) || die "Can't get file list: $!\n";
my @file = readdir ( $d );
closedir ( $d );
foreach ( @file )
{
    next if /^\.{1,2}$/;
    $time = -M $_;
    if ( $time > $max )
    {
        $max = $time;
        $oldest = $_;
    }
}
print "$oldest was modified $max days ago\n";