Here you can find the source of getWeekOfYear(Date d, Locale locale)
public static int getWeekOfYear(Date d, Locale locale)
//package com.java2s; /*//from ww w . java 2 s. 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; import java.util.Locale; public class Main { public static int getWeekOfYear(Date d, Locale locale) { Calendar c = Calendar.getInstance(getSafeLocale(locale)); c.setTime(d); return c.get(Calendar.WEEK_OF_YEAR); } private static Locale getSafeLocale(Locale locale) { return (locale == null) ? Locale.getDefault() : locale; } public static Date setTime(Date date, int hours, int minutes, int seconds, int millis) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.set(Calendar.HOUR_OF_DAY, hours); calendar.set(Calendar.MINUTE, minutes); calendar.set(Calendar.SECOND, seconds); calendar.set(Calendar.MILLISECOND, millis); return calendar.getTime(); } }