Java Week Day getFirstDayOfWeek(final Date date)

Description

get First Day Of Week

License

Open Source License

Declaration

public static Date getFirstDayOfWeek(final Date date) 

Method Source Code

//package com.java2s;
/*//from   ww w .  jav  a  2  s . 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 Date getFirstDayOfWeek(final Date date) {
        if (dayOfWeek(date) == 1) {
            return addDays(date, -6);
        }
        return addDays(date, -1 * (dayOfWeek(date) - 2));
    }

    public static int dayOfWeek(final Date date) {
        Calendar calendar = GregorianCalendar.getInstance();
        calendar.setTime(date);
        int weekday = calendar.get(Calendar.DAY_OF_WEEK);
        return weekday;
    }

    public static Date addDays(Date eredeti, int mennyit) {
        return add(eredeti, Calendar.DAY_OF_YEAR, mennyit);
    }

    public static Date add(Date eredeti, int mihez, int mennyit) {
        if (eredeti == null) {
            return null;
        }
        Calendar cal = new GregorianCalendar();
        cal.setTime(eredeti);
        cal.add(mihez, mennyit);

        return cal.getTime();
    }
}

Related

1. getFirstDayOfLastWeek(Date date)
2. getFirstDayOfWeek()
3. getFirstDayOfWeek()
4. getFirstDayOfWeek(Date date)
5. getFirstDayOfWeek(Date date)
6. getFirstDayOfWeek(String format)
7. getFirstDayOfWeek(String str, int week)
8. getFirstDayOfWeek(String week)
9. getFirstDayOfWeek(String week)