Here you can find the source of dateAdd(Date date, int field, int amount)
public static Date dateAdd(Date date, int field, int amount)
//package com.java2s; /*/*from w ww. j a v a2 s . c om*/ * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.util.Date; import java.util.Calendar; public class Main { public static Date dateAdd(Date date, int field, int amount) { Calendar calendar = Calendar.getInstance(); try { calendar.setTime(date); calendar.add(field, amount); return calendar.getTime(); } catch (Exception e) { System.out.println("DateAdd Exception :" + e); return null; } } }