Java Day of Week getISO8601WeekOfYear(Date date)

Description

Computes the ISO-8601 week of year for the given date See: http://stackoverflow.com/questions/147178/what-is-a-good-simple-way-to-compute-iso-8601-week-number

License

Apache License

Parameter

Parameter	Description
date	the date of choice

Return

the ISO-8601 week number of the date

Declaration

public static int getISO8601WeekOfYear(Date date)

Method Source Code

//package com.java2s;
/*/*from w  ww  .java 2s .c  o  m*/
 * Copyright 2016 Danish Maritime Authority.
 *
 * Licensed 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;

public class Main {
    /**
     * Computes the ISO-8601 week of year for the given date
     * See: http://stackoverflow.com/questions/147178/what-is-a-good-simple-way-to-compute-iso-8601-week-number
     *
     * @param date the date of choice
     * @return the ISO-8601 week number of the date
     */
    public static int getISO8601WeekOfYear(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setMinimalDaysInFirstWeek(4);
        calendar.setFirstDayOfWeek(Calendar.MONDAY);
        calendar.setTime(date);
        return calendar.get(Calendar.WEEK_OF_YEAR);
    }
}