If you want to use a module then look at DateTime or one of its friends (see http://datetime.perl.org/). Please don't use Date::Manip as it's rather old and slow.

However, it's quite possible to do simple data manipulation like this without using CPAN modules.

#!/usr/bin/perl

use strict;
use warnings;

use Time::Local;
use POSIX 'strftime';

my $start = date2epoch('2005-07-12');
my $end   = date2epoch('2005-08-03');

my $curr = $start;
while ($curr <= $end) {
  print strftime "%Y-%m-%d\n", localtime($curr);
  $curr += 24 * 60 * 60;
}

sub date2epoch {
  my ($y, $m, $d) = split /-/, shift;

  return timelocal(0, 0, 12, $d, $m - 1, $y - 1900);
}
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