AX - How calculate only with opened days in calendar

Use WorkCalendarSched class:

WorkCalendarSched workCalendarSched;
date dateOnlyWorking, dateAll;

workCalendarSched = new workCalendarSched();

dateOnlyWorking = 
  workCalendarSched.schedDate( SchedDirection::Backward, today(), 6, NoYes::Yes, "5x24" );
dateAll = 
  workCalendarSched.schedDate( SchedDirection::Backward, today(), 6, NoYes::No, "5x24" );

info( date2str( dateOnlyWorking, 321, DateDay::Digits2, DateSeparator::Hyphen, 
      DateMonth::Digits2, DateSeparator::Hyphen, DateYear::Digits4 ) );
info( date2str( dateAll, 321, DateDay::Digits2, DateSeparator::Hyphen, 
      DateMonth::Digits2, DateSeparator::Hyphen, DateYear::Digits4 ) );

Output: