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package SL::DB::Helper::AccountingPeriod;

use strict;
use SL::Locale::String qw(t8);

use parent qw(Exporter);
use SL::DBUtils;
our @EXPORT = qw(get_balance_starting_date get_balance_startdate_method_options);

use Carp;

sub get_balance_startdate_method_options {
[
{ title => t8("After closed period"), value => "closed_to" },
{ title => t8("Start of year"), value => "start_of_year" },
{ title => t8("All transactions"), value => "all_transactions" },
{ title => t8("Last opening balance or all transactions"), value => "last_ob_or_all_transactions" },
{ title => t8("Last opening balance or start of year"), value => "last_ob_or_start_of_year" },
]
}

sub get_balance_starting_date {
my ($self, $asofdate, $startdate_method) = @_;

$asofdate ||= DateTime->today_local;
$startdate_method ||= $::instance_conf->get_balance_startdate_method;

unless ( ref $asofdate eq 'DateTime' ) {
$asofdate = $::locale->parse_date_to_object($asofdate);
};

my $dbh = $::form->get_standard_dbh;


# We could use the following objects to determine the starting date for
# calculating the balance from asofdate (the reference date for the balance):
# * start_of_year - 1.1., no deviating fiscal year supported
# * closed_to - all transactions since the books were last closed
# * last_ob - all transactions since last opening balance transaction (usually 1.1.)
# * mindate - all transactions in database

my $start_of_year = $asofdate->clone();
$start_of_year->set_day(1);
$start_of_year->set_month(1);

# closedto assumes that we only close the books at the end of a fiscal year,
# never during the fiscal year. If this assumption is valid closedto should
# also work for deviating fiscal years. But as the trial balance (SuSa)
# doesn't yet deal with deviating fiscal years, and it is useful to also close
# the books after a month has been exported via DATEV, this method of
# determining the starting date isn't recommended and is not the default.

my $closedto = $::instance_conf->get_closedto;
if ($closedto) {
$closedto = $::locale->parse_date_to_object($closedto);
$closedto->subtract(years => 1) while ($asofdate - $closedto)->is_negative;
$closedto->add(days => 1);
};

my ($query, $startdate, $last_ob, $mindate);
$query = qq|select max(transdate) from acc_trans where ob_transaction is true and transdate <= ?|;
($last_ob) = selectrow_query($::form, $dbh, $query, $::locale->format_date(\%::myconfig, $asofdate));
$last_ob = $::locale->parse_date_to_object($last_ob) if $last_ob;

$query = qq|select min(transdate) from acc_trans|;
($mindate) = selectrow_query($::form, $dbh, $query);
$mindate = $::locale->parse_date_to_object($mindate);

# the default method is to use all transactions ($mindate)

if ( $startdate_method eq 'closed_to' and $closedto ) {
# if no closedto is configured use default
return $::locale->format_date(\%::myconfig, $closedto);

} elsif ( $startdate_method eq 'start_of_year' ) {

return $::locale->format_date(\%::myconfig, $start_of_year);

} elsif ( $startdate_method eq 'all_transactions' ) {

return $::locale->format_date(\%::myconfig, $mindate);

} elsif ( $startdate_method eq 'last_ob_or_all_transactions' and $last_ob ) {
# use default if there are no ob transactions

return $::locale->format_date(\%::myconfig, $last_ob);

} elsif ( $startdate_method eq 'last_ob_or_start_of_year' ) {

if ( $last_ob ) {
return $::locale->format_date(\%::myconfig, $last_ob);
} else {
return $::locale->format_date(\%::myconfig, $start_of_year);
};

} else {
# default action, also used for closedto and last_ob_or_all_transactions if
# there are no valid dates

return $::locale->format_date(\%::myconfig, $mindate);
};

};

1;
__END__

=pod

=encoding utf8

=head1 NAME

SL::DB::Helper::AccountingPeriod - Helper functions for calculating dates relative to the financial year

=head1 FUNCTIONS

=over 4

=item C<get_balance_startdate_method_options>

Returns an arrayref of translated options for determining the startdate of a
balance period or the yearend period. To be used as the options for a dropdown.

=item C<get_balance_starting_date $date $startdate_method>

Given a date this method calculates and returns the starting date of the
financial period relative to that date, according to the configured
balance_startdate_method in the client configuration. The returned date is
locale-formatted and can be used for SQL queries.

If $date isn't a DateTime object a date string is assumed, which then gets
date-parsed.

If no argument is passed the current day is assumed as default.

If no startdate method is passed, the default method from defaults is used.

=back

=head1 BUGS

Nothing here yet.

=head1 AUTHOR

G. Richardson E<lt>information@kivitendo-premium.deE<gt>

=cut
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