Java Day of Week getFirstDayOfWeek(int year, int week)

Description

get First Day Of Week

License

Apache License

Declaration

public static int getFirstDayOfWeek(int year, int week) 

Method Source Code

//package com.java2s;
/*//from w  ww  .  j  a  va 2  s . c om
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.
 *
 * The Apereo Foundation 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.Locale;

public class Main {
    public static int getFirstDayOfWeek(int year, int week) {
        Calendar c = Calendar.getInstance(Locale.US);
        c.set(year, 1, 1, 0, 0, 0);
        c.set(Calendar.WEEK_OF_YEAR, week);
        c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        int dayOfYear = c.get(Calendar.DAY_OF_YEAR);
        if (c.get(Calendar.YEAR) < year) {
            Calendar x = Calendar.getInstance(Locale.US);
            x.set(c.get(Calendar.YEAR), 11, 31, 0, 0, 0);
            dayOfYear -= x.get(Calendar.DAY_OF_YEAR);
        } else if (c.get(Calendar.YEAR) > year) {
            Calendar x = Calendar.getInstance(Locale.US);
            x.set(year, 11, 31, 0, 0, 0);
            dayOfYear += x.get(Calendar.DAY_OF_YEAR);
        }
        return dayOfYear;
    }
}

Related

1. getDaysByWeek2(Integer month, Integer year, Integer begin)
2. getDayWeekDate(String dateStr)
3. getDayWeekDateStr(Date date)
4. getEndOfWeek(Date date)
5. getFirstDayOfLastWeek(Date date)
6. getFirstDayOfWeek(int year, int week)
7. getFirstDayOfWeek(int year, int week)
8. getFirstDayWeekly(final int year)
9. getFirstMonthWeek(Date month)