Java Calendar Add or substract weeks to current date

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

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