Here you can find the source of plusDay(Date date, int plusWeek)
public static Date plusDay(Date date, int plusWeek)
//package com.java2s; /******************************************************************************* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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.//w ww . j a v a2s.com *******************************************************************************/ import java.util.*; public class Main { public static Date plusDay(Date date, int plusWeek) { return plusInteger(date, Calendar.DAY_OF_MONTH, plusWeek); } private static Date plusInteger(Date date, int dateType, int amount) { if (date != null) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.add(dateType, (0 - amount)); date = calendar.getTime(); } return date; } }