Here you can find the source of afterMonth(Date dateTime)
public static Date afterMonth(Date dateTime)
//package com.java2s; /*/*ww w. j a v a 2 s. com*/ * DateUtils.java * * 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 2 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 Library General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Author: Winter Lau (javayou@gmail.com) * http://dlog4j.sourceforge.net */ import java.util.Calendar; import java.util.Date; public class Main { public static Date afterMonth(Date dateTime) { Calendar now = Calendar.getInstance(); now.setTime(dateTime); int year = now.get(Calendar.YEAR); int month = now.get(Calendar.MONTH) + 1; int day = 1; now.set(year, month, day); return now.getTime(); } }