projekt kivitendo

  my $config     = shift;

  my $cur_date   = $config->first_billing_date        || $config->start_date;

  my $start_date = $config->get_previous_invoice_date || DateTime->new(year => 1970, month => 1, day => 1);

  my $end_date   = $config->end_date                  || DateTime->new(year => 2100, month => 1, day => 1);

  my $tomorrow   = DateTime->today_local->add(days => 1);

  my $period_len = $config->get_period_length;

  $end_date      = $tomorrow if $end_date > $tomorrow;

  my @dates;

  while (1) {

    last if $cur_date >= $end_date;

    push @dates, $cur_date->clone if $cur_date > $start_date;

    $cur_date->add(months => $period_len);

  }

  return @dates;