#!/usr/bin/perl -w
use strict;
use Time::Local;  # a CORE function (no install needed)
# $time = timelocal($sec,$min,$hour,$mday,$mon,$year);

print "current time is: ".localtime(),"\n";
print "seconds left until 8/30/2012 5:32 AM\n";
print seconds_left(2012,8,30,5,32,0), "\n";

sub seconds_left 
{
   my ($year, $month, $dayOfMonth, $hour, $minutes, $seconds) = @_;
     
   my $expiration_seconds = timelocal($seconds, $minutes, $hour, 
                                      $dayOfMonth, $month-1, $year);
                                      
   my $current_seconds = time();

   return ($expiration_seconds - $current_seconds);
}

__END__
current time is: Thu Aug 30 05:31:30 2012
seconds left until 8/30/2012 5:32 AM
30