sub banking-day-offset(Date $start, UInt $offset, Date @hollydays?) { ($start..*).grep({ .day-of-week == none(6, 7) && $_ == @hollydays.none})[$offset] } say banking-day-offset Date.new("2024-03-12"), 27, Array[Date].new: (Date.new: "2024-03-$_" for <17 18 29 30 31>);