Java Calendar Week setStartOfWeek(Calendar date)

Description

Sets the date to the begin of the week.

License

Open Source License

Declaration

public static void setStartOfWeek(Calendar date) 

Method Source Code

//package com.java2s;
/*//from  w ww . ja v  a 2s .co  m
 * Copyright (C) 2002-2006 Stefan Stiller
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

import java.util.Date;
import java.util.Calendar;

public class Main {
    public final static long SECOND = 1000;
    public final static long MINUTE = 60 * SECOND;
    private static int firstDayOfWeek = Calendar.MONDAY;

    /**
     * Sets the date to the begin of the week.
     */
    public static void setStartOfWeek(Calendar date) {
        date.add(Calendar.DATE, -getDayOfWeek(date));
        date.set(Calendar.HOUR_OF_DAY, 0);
        date.set(Calendar.MINUTE, 0);
        date.set(Calendar.SECOND, 0);
        date.set(Calendar.MILLISECOND, 0);
    }

    public static Date add(Date date, int field, int value) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(field, value);
        return calendar.getTime();
    }

    /**
     * Returns the day of week depending if the week starts on sunday or monday.
     *
     * @return 0 for the first day of the week and 6 for the last.
     */
    public static int getDayOfWeek(Calendar date) {
        int day = date.get(Calendar.DAY_OF_WEEK);
        if (getFirstDayOfWeek() == Calendar.SUNDAY)
            return day - 1;
        else {
            if (day >= Calendar.MONDAY)
                return day - Calendar.MONDAY;
            else
                return 6;
        }
    }

    public static int getFirstDayOfWeek() {
        return firstDayOfWeek;
    }
}

Related

1. isWeekEnd(Calendar c)
2. isWeekend(Calendar cal)
3. isWeekend(GregorianCalendar date)
4. lastDayOfWeek(Calendar cal)
5. lastDayOfWeek(Calendar calendar)
6. setTimeAsFirstDayOfWeek(Calendar calendar)
7. truncateToWeek(GregorianCalendar date)
8. weekDay(Calendar date)
9. weekFloor(Calendar calendar)