Here you can find the source of getWeekOfYear(Date date, Locale locale)
public static int getWeekOfYear(Date date, Locale locale)
//package com.java2s; /*// ww w. ja va 2s . co m * #%L * Webstar Newsletter * %% * Copyright (C) 2013 Webstar Csoport Kft. * %% * 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 3 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 General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/gpl-3.0.html>. * #L% */ import java.util.*; public class Main { public static int getWeekOfYear(Date date, Locale locale) { Calendar c = new GregorianCalendar(locale); c.setTime(date); return c.get(Calendar.WEEK_OF_YEAR); } public static int getWeekOfYear(Date date) { return getWeekOfYear(date, Locale.getDefault()); } }