Here you can find the source of addDays(Date date, int i)
public static Date addDays(Date date, int i)
//package com.java2s; /*// w w w . j a va 2 s.c o m Strandz LGPL - an API that matches the user to the data. Copyright (C) 2007 Chris Murphy Strandz LGPL is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA The authors can be contacted via www.strandz.org */ import java.util.Calendar; import java.util.Date; public class Main { public static Date addDays(Date date, int i) { Date result; Calendar calendar = addDaysRetCalendar(date, i); result = calendar.getTime(); return result; } public static Calendar addDaysRetCalendar(Date date, int i) { Calendar result = Calendar.getInstance(); result.setTime(date); result.add(Calendar.DAY_OF_YEAR, i); return result; } }