What am I doing wrong here? It was working but then again I say that all the time. Please advise.

use LWP::Simple;
use warnings;
use strict;


my $url = 'www.perl.com';
my $content = get($url);

my ($lastMod) = (head($url))[2];
my ($lastModFormat) = scalar localtime($lastMod);

print "$lastModFormat\n";
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The above prints out:

Use of uninitialized value in localtime at C:\Perl\bin\headerTest.pl l
+ine 12.
Wed Dec 31 19:00:00 1969
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