Java Day of Week weekStart(Date date)

Description

week Start

License

Apache License

Declaration

public static Date weekStart(Date date) 

Method Source Code

//package com.java2s;
/*// w w  w . j  ava2  s  . c  o m
 * Copyright 2012 Evgeny Dolganov (evgenij.dolganov@gmail.com).
 *
 * 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 {
    public static Date weekStart(Date date) {
        if (date == null) {
            return null;
        }
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(dateStart(date));
        calendar.set(Calendar.DAY_OF_WEEK, calendar.getFirstDayOfWeek());
        return calendar.getTime();
    }

    public static Date dateStart(Date date) {
        if (date == null) {
            return null;
        }

        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime();
    }
}

Related

1. WeekOfTheYear(Date dt)
2. weekOfYear(Date date)
3. weeksBetween(Date date1, Date date2)
4. weeksBetween(Date early, Date late)
5. weekStart(Date date)