Add or substract weeks to current date using Java Calendar


/*
  Add or substract weeks to current date using Java Calendar
  This example shows how to add or substract weeks in current date and time values
  using Java Calendar class.
*/

import java.util.Calendar;

public class AddWeeksToCurrentWeek {

 
public static void main(String[] args) {
 
   
//create Calendar instance
   
Calendar now = Calendar.getInstance();
   
    System.out.println
("Current date : " + (now.get(Calendar.MONTH) + 1)
                       
+ "-"
                       
+ now.get(Calendar.DATE)
                       
+ "-"
                       
+ now.get(Calendar.YEAR));
                       
    System.out.println
("Current week of month is : " +
                now.get
(Calendar.WEEK_OF_MONTH));
               
    System.out.println
("Current week of year is : " +
                now.get
(Calendar.WEEK_OF_YEAR));

   
//add week to current date using Calendar.add method
   
now.add(Calendar.WEEK_OF_YEAR,1);
   
    System.out.println
("date after one week : " + (now.get(Calendar.MONTH) + 1)
                       
+ "-"
                       
+ now.get(Calendar.DATE)
                       
+ "-"
                       
+ now.get(Calendar.YEAR));
   
   
//substract week from current date
   
now =Calendar.getInstance();
    now.add
(Calendar.WEEK_OF_YEAR,-50);
    System.out.println
("date before 50 weeks : " + (now.get(Calendar.MONTH) + 1)
                       
+ "-"
                       
+ now.get(Calendar.DATE)
                       
+ "-"
                       
+ now.get(Calendar.YEAR));

 
}
}

/*
Typical output would be
Current date : 12-25-2007
Current week of month is : 5
Current week of year is : 52
date after one week : 1-1-2008
date before 50 weeks : 1-9-2007
*/