Here you can find the source of addDays(int days)
public static String addDays(int days)
//package com.java2s; /*//from w ww . j a v a2 s . c o m * Copyright 2010 Mttang.com All right reserved. This software is the * confidential and proprietary information of Mttang.com ("Confidential * Information"). You shall not disclose such Confidential Information and shall * use it only in accordance with the terms of the license agreement you entered * into with Mttang.com. */ import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; public class Main { static final SimpleDateFormat yyyyMMdd = new SimpleDateFormat("yyyy-MM-dd"); public static String addDays(int days) { GregorianCalendar cal = new GregorianCalendar(); cal.setTime(new Date()); cal.add(Calendar.DATE, days); return yyyyMMdd.format(cal.getTime()); } }