+ $year = DateTime->today_local->year;
+ $year = 2019 if $year == 2020; # use year 2019 in 2020, because of tax rate change in Germany
+ $dt = DateTime->new(year => $year, month => 1, day => 12);
+ $dt_5 = $dt->clone->add(days => 5);
+ $dt_10 = $dt->clone->add(days => 10);