Default business calendar

The business calendar by default can only have a weekly schedule. Example:

// get the 'defualt' business calendar 
const workCalendar = await  System.productionSchedule.workCalendars.getDefault(); 
// fill out the  weekly schedule (cycle) 
const workSchedule: WorkSchedule<'weekly'> = { 
     type: 'weekly', 
    cycle: [], 
}; 
for (let i = 1; i <= 7; i++ ) { 
     const daySettings: CalendarDaySettings = { 
        startAt: new TTime(9, 0,  0, 0), 
        endAt: new TTime(18, 0, 0, 0), 
        breaks: [  
            { 
                startAt: new TTime(12, 0, 0, 0),  
                endAt: new TTime(13, 0, 0, 0), 
                description:  'Lunch break', 
            }, 
        ]; 
        isWorkingDay: true,  
        isHolidayDay: false, 
    }; 
    switch (i) { 
        case 1:  
            daySettings.description = 'Monday'; 
            break;  
        case 2: 
            daySettings.description = 'Tuesday';  
            break; 
        case 3: 
            daySettings.description =  'Wednesday'; 
            break; 
        case 4: 
             daySettings.description = 'Thursday'; 
            break; 
        case 5:  
            daySettings.description = 'Friday'; 
            break;  
        case 6: 
            daySettings.isWorkingDay = false; 
             daySettings.isHolidayDay = false; 
            daySettings.description =  'Saturday'; 
            break; 
        case 7: 
             daySettings.isWorkingDay = false; 
            daySettings.isHolidayDay =  false; 
            daySettings.description = 'Sunday'; 
            break;  
    } 
    workSchedule.cycle.push(daySettings); 
} 
// apply the schdule  to the calendar 
workCalendar.setSchedule(workSchedule); 
// save the  business calendar 
await workCalendar.save();