How to add Business hours to Date considering not adding weekends ? - Java

Question

I want to add certain number of hours to date, ignoring the weekends

For example,

(Friday 18:00) + 48 = (Tuseday 18:00) (Saturday and Sunday are ignored)

Answer 1

Below code does solve the purpose.

public static Date addBusinessHours(Calendar startDate, int hours, int workingHourStart, int workingHourEnd){
    System.out.println("Entering: Date Time " + startDate.getTime() + " | Remaining Hours: "+ hours + " | Working hours ("+workingHourStart+"-"+workingHourEnd+")");

    if(hours == 0){
        return startDate.getTime();
    }
    int hourOfDay = startDate.get(Calendar.HOUR_OF_DAY);
    if(startDate.get(Calendar.MINUTE) > 0){
        hourOfDay = hourOfDay +1;
    }

    int dayOfWeek = startDate.get(Calendar.DAY_OF_WEEK);

    if(dayOfWeek == Calendar.SATURDAY){
        startDate.add(Calendar.DATE, 2);
        startDate.set(Calendar.HOUR_OF_DAY, workingHourStart);
        startDate.set(Calendar.MINUTE, 0);
        startDate.set(Calendar.SECOND, 0);
        addBusinessHours(startDate, hours, workingHourStart, workingHourEnd);
    }
    if(dayOfWeek == Calendar.SUNDAY){
        startDate.add(Calendar.DATE, 1);
        startDate.set(Calendar.HOUR_OF_DAY, workingHourStart);
        startDate.set(Calendar.MINUTE, 0);
        startDate.set(Calendar.SECOND, 0);
        addBusinessHours(startDate, hours, workingHourStart, workingHourEnd);
    }

    if(dayOfWeek != Calendar.SATURDAY && dayOfWeek != Calendar.SUNDAY){
        if(hourOfDay < workingHourStart){
            startDate.set(Calendar.HOUR_OF_DAY, workingHourStart);
            startDate.set(Calendar.MINUTE, 0);
            startDate.set(Calendar.SECOND, 0);
            hourOfDay = startDate.get(Calendar.HOUR_OF_DAY);
            dayOfWeek = startDate.get(Calendar.DAY_OF_WEEK);
            addBusinessHours(startDate, hours, workingHourStart, workingHourEnd);
        }
        else if(hourOfDay >= workingHourEnd){

            startDate.add(Calendar.DATE, 1);
            startDate.set(Calendar.HOUR_OF_DAY, workingHourStart);
            startDate.set(Calendar.MINUTE, 0);
            startDate.set(Calendar.SECOND, 0);
            hourOfDay = startDate.get(Calendar.HOUR_OF_DAY);
            dayOfWeek = startDate.get(Calendar.DAY_OF_WEEK);
            addBusinessHours(startDate, hours, workingHourStart, workingHourEnd);
        }

        else if(hourOfDay >= workingHourStart && hourOfDay < workingHourEnd){
            if(hours+hourOfDay <= workingHourEnd){
                startDate.add(Calendar.HOUR_OF_DAY, hours);
                return startDate.getTime();
            }else{
                //System.out.println("¤¤" + startDate.getTime() );
                startDate.add(Calendar.DATE, 1);
                //System.out.println("¤¤" + startDate.getTime() );
                startDate.set(Calendar.HOUR_OF_DAY, workingHourStart);
                startDate.set(Calendar.MINUTE, 0);
                startDate.set(Calendar.SECOND, 0);
                //System.out.println("¤¤" + startDate.getTime() );

                System.out.println("##"+hours+ "##"+ workingHourEnd + "##" + hourOfDay);
                int remaining_hours = hours - (workingHourEnd - hourOfDay);
                addBusinessHours(startDate, remaining_hours, workingHourStart, workingHourEnd);
            }
        }
    }

    return startDate.getTime();
}