+ # Legacy name.
+ goto &from_kivitendo;
+}
+
+sub add_business_duration {
+ my ($self, %params) = @_;
+
+ my $abs_days = abs $params{days};
+ my $neg = $params{days} < 0;
+ my $bweek = $params{businessweek} || 5;
+ my $weeks = int ($abs_days / $bweek);
+ my $days = $abs_days % $bweek;
+
+ if ($neg) {
+ $self->subtract(weeks => $weeks);
+ $self->add(days => 8 - $self->day_of_week) if $self->day_of_week > $bweek;
+ $self->subtract(days => $self->day_of_week > $days ? $days : $days + (7 - $bweek));
+ } else {
+ $self->add(weeks => $weeks);
+ $self->subtract(days => $self->day_of_week - $bweek) if $self->day_of_week > $bweek;
+ $self->add(days => $self->day_of_week + $days <= $bweek ? $days : $days + (7 - $bweek));
+ }
+
+ $self;
+}
+
+sub add_businessdays {
+ my ($self, %params) = @_;
+
+ $self->add_business_duration(%params);
+}
+
+sub subtract_businessdays {
+ my ($self, %params) = @_;
+
+ $params{days} *= -1;
+
+ $self->add_business_duration(%params);
+}
+
+sub end_of_month {
+ my ($self) = @_;
+ return $self->truncate(to => 'month')->add(months => 1)->subtract(days => 1);
+}
+
+sub next_workday {
+ my ($self, %params) = @_;
+
+ my $extra_days = $params{extra_days} // 1;
+ $self->add(days => $extra_days);
+
+ my $day_of_week = $self->day_of_week;
+ $self->add(days => (8 - $day_of_week)) if $day_of_week >= 6;
+
+ return $self;
+}
+
+sub from_ymd {
+ my ($class, $ymd_string) = @_;
+
+ if (!$ymd_parser) {
+ $ymd_parser = DateTime::Format::Strptime->new(
+ pattern => '%Y-%m-%d',
+ locale => 'de_DE',
+ time_zone => 'local'
+ );
+ }
+
+ return $ymd_parser->parse_datetime($ymd_string // '');
+}
+
+sub from_ymdhms {
+ my ($class, $ymdhms_string) = @_;
+
+ if (!$ymdhms_parser) {
+ $ymdhms_parser = DateTime::Format::Strptime->new(
+ pattern => '%Y-%m-%dT%H:%M:%S',
+ locale => 'de_DE',
+ time_zone => 'local'
+ );
+ }
+
+ $ymdhms_string //= '';
+ $ymdhms_string =~ s{ }{T};
+
+ return $ymdhms_parser->parse_datetime($ymdhms_string);