Here you can find the source of createIsoCalendar()
private static Calendar createIsoCalendar()
//package com.java2s; /*/*from w w w . ja v a2s . c o m*/ * DomUI Java User Interface - shared code * Copyright (c) 2010 by Frits Jalvingh, Itris B.V. * * This library 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 * * See the "sponsors" file for a list of supporters. * * The latest version of DomUI and related code, support and documentation * can be found at http://www.domui.org/ * The contact for the project is Frits Jalvingh <jal@etc.to>. */ import java.util.Calendar; import java.util.GregorianCalendar; public class Main { /** * The ISO week-numbering year starts at the first day (Monday) of week 01 and ends at the Sunday before the new ISO year * (hence without overlap or gap). It consists of 52 or 53 full weeks. If 1 January is on a Monday, Tuesday, Wednesday * or Thursday, it is in week 01. If 1 January is on a Friday, Saturday or Sunday, it is in week 52 or 53 of the previous * year (there is no week 00). 28 December is always in the last week of its year. * * @return */ private static Calendar createIsoCalendar() { Calendar cal = new GregorianCalendar(); cal.clear(); cal.setMinimalDaysInFirstWeek(4); cal.setFirstDayOfWeek(2); return cal; } }