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  use Class::CGI
    handlers => {
...
  my $date = $cgi->param('invoice_date');
  my $date = $cgi->param('sales_date');
  my $day  = $date->day;

  use Class::CGI
    handlers => {
...
  my $date = $cgi->param('invoice_date');
  my $date = $cgi->param('sales_date');
  my $day  = $date->day;

package My::Date::Handler;

...
      );
  }
  1;

  use Class::CGI
    handlers => {
...
  my $sales_date = $cgi->param('sales_date');
  my $customer = $cgi->param('customer_id');
  my $referrer = $cgi->param('referrar_id');