Here you can find the source of addDay(Date date, int num)
public static Date addDay(Date date, int num)
//package com.java2s; /*/* w w w .ja va2s .co m*/ * Copyright (C) 2014 Markus Junginger, greenrobot (http://greenrobot.de) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.Calendar; import java.util.Date; public class Main { public static Date addDay(Date date, int num) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.DAY_OF_YEAR, num); return c.getTime(); } public static void setTime(Calendar calendar, int hourOfDay, int minute, int second, int millisecond) { calendar.set(Calendar.HOUR_OF_DAY, hourOfDay); calendar.set(Calendar.MINUTE, minute); calendar.set(Calendar.SECOND, second); calendar.set(Calendar.MILLISECOND, millisecond); } }