How to get current date and add five working days in Java [duplicate]

Question

I want two dates. 1) Current date in MM/dd/yy format 2) Modified date which will be the adition of five business days(Mon-Fri) to current date and it should be in MMM dd, yyyy format.

So if my current is 9th june than currentDate should be 06/09/14 and modifiedDate should be Jun 13, 2014.

How to do this?

Answer 1

This will add working days (Mon-Fri) and will present dates in the required format.

UPDATED 6 Jul 2020

1. Now custom days can be used as non working days (see the list NON_BUSINESS_DAYS)
2. Now even the past date can be calculated as well (set businessDays as negative val)

---

import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

public class BusinessDateExamples {

    private static final List<Integer> NON_BUSINESS_DAYS = Arrays.asList(
                Calendar.SATURDAY,
                Calendar.SUNDAY
            );
    
    /**
     * Returns past or future business date
     * @param date starting date
     * @param businessDays number of business days to add/subtract
     *          <br/>note: set this as negative value to get past date
     * @return past or future business date by the number of businessDays value
     */
    public static Date businessDaysFrom(Date date, int businessDays) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        for (int i = 0; i < Math.abs(businessDays);) {
            // here, all days are added/subtracted
            calendar.add(Calendar.DAY_OF_MONTH, businessDays > 0 ? 1 : -1);
            
            // but at the end it goes to the correct week day.
            // because i is only increased if it is a week day
            if (!NON_BUSINESS_DAYS.contains(calendar.get(Calendar.DAY_OF_WEEK))){
                i++;
            }
        }
        return calendar.getTime();
    }
    
    public static void main(String...strings) {
        SimpleDateFormat s = new SimpleDateFormat("MM/dd/yy ( MMM dd, yyyy )");
        
        Date date = new Date();
        int businessDays = 5;
        
        System.out.println(s.format(date));
        
        System.out.print("+ " + businessDays + " Business Days = ");
        System.out.println(s.format(businessDaysFrom(date, businessDays)));
        
        System.out.print("- " + businessDays + " Business Days = ");
        System.out.println(s.format(businessDaysFrom(date, -1 * businessDays)));
    }
}

---

    Date date=new Date();
    Calendar calendar = Calendar.getInstance();
    date=calendar.getTime(); 
    SimpleDateFormat s;
    s=new SimpleDateFormat("MM/dd/yy");
    
    System.out.println(s.format(date));
    
    int days = 5;
    for(int i=0;i<days;)
    {
        calendar.add(Calendar.DAY_OF_MONTH, 1);
        //here even sat and sun are added
        //but at the end it goes to the correct week day.
        //because i is only increased if it is week day
        if(calendar.get(Calendar.DAY_OF_WEEK)<=5)
        {
            i++;
        }

    }
    date=calendar.getTime(); 
    s=new SimpleDateFormat("MMM dd, yyyy");
    System.out.println(s.format(date));

Ref : https://stackoverflow.com/a/15339851/3603806 and https://stackoverflow.com/a/11356123/3603806

Answer 2

The notion of working days is not implemented in Java, it's too subject to interpretation (for example, many international companies have their own holidays). Code below uses isWorkingDay(), which only returns false for weekends - add your holidays there.

public class Test {

    public static void main(String[] args) {
        Calendar cal = new GregorianCalendar();
        // cal now contains current date
        System.out.println(cal.getTime());

        // add the working days
        int workingDaysToAdd = 5;
        for (int i=0; i<workingDaysToAdd; i++)
            do {
                cal.add(Calendar.DAY_OF_MONTH, 1);
            } while ( ! isWorkingDay(cal));
        System.out.println(cal.getTime());
    }

    private static boolean isWorkingDay(Calendar cal) {
        int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
        if (dayOfWeek == Calendar.SUNDAY || dayOfWeek == Calendar.SATURDAY)
            return false;
        // tests for other holidays here
        // ...
        return true;
    }

}