Here you can find the source of getDayOfAddDay(final Calendar calendar, final int day)
public static Calendar getDayOfAddDay(final Calendar calendar, final int day)
//package com.java2s; /**/* w ww . java2s.c o m*/ * 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. */ import java.util.Calendar; import java.util.Date; public class Main { public static Date getDayOfAddDay(final Date date, final int day) { Calendar src = Calendar.getInstance(); src.setTime(date); Calendar dst = getDayOfAddDay(src, day); return dst.getTime(); } public static Calendar getDayOfAddDay(final Calendar calendar, final int day) { Calendar cln = Calendar.getInstance(); cln.setTimeInMillis(calendar.getTimeInMillis()); cln.add(Calendar.DAY_OF_MONTH, day); return cln; } }