How To Add Working Days To A Date In Java

Chapter: Date and Time Last Updated: 22-06-2023 14:15:14 UTC

Program:

            /* ............... START ............... */
                
import java.time.DayOfWeek;
import java.time.LocalDate;

public class WorkingDaysCalculator {
    public static void main(String[] args) {
        LocalDate startDate = LocalDate.of(2023, 6, 22); // Starting date
        int workingDaysToAdd = 5; // Number of working days to add

        LocalDate resultDate = addWorkingDays(startDate, workingDaysToAdd);
        System.out.println("Result: " + resultDate);
    }

    public static LocalDate addWorkingDays(LocalDate startDate, int workingDays) {
        int count = 0;
        while (workingDays > 0) {
            startDate = startDate.plusDays(1);
            if (isWorkingDay(startDate)) {
                workingDays--;
            }
            count++;
        }
        System.out.println("Loop iterations: " + count);
        return startDate;
    }

    public static boolean isWorkingDay(LocalDate date) {
        DayOfWeek dayOfWeek = date.getDayOfWeek();
        return dayOfWeek != DayOfWeek.SATURDAY && dayOfWeek != DayOfWeek.SUNDAY;
    }
}

                /* ............... END ............... */
        

Output

Result: 2023-06-29
Loop iterations: 7

In this example, it adds 5 working days to the starting date of June 22, 2023, resulting in 
the output date of June 29, 2023. The loop iterations indicate that it took 7 iterations to find the 5 
working days, considering weekends as non-working days.

Notes:

  • In the above example, we have a method addWorkingDays that takes a LocalDate object as the starting date and an integer representing the number of working days to add. It iterates over each day, checks if it is a working day using the isWorkingDay method, and decrements the working days count until it reaches 0.
  • The isWorkingDay method checks if the given date is not a Saturday or Sunday, assuming these are non-working days.
  • The result is the LocalDate object after adding the specified number of working days.
  • Please note that this example assumes a simple scenario where weekends (Saturday and Sunday) are considered non-working days. If you have additional holidays or other non-working days to consider, you would need to modify the isWorkingDay method accordingly.
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