get Time For First Day Of Week - Java java.util

Java examples for java.util:Week

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Description

get Time For First Day Of Week

Demo Code

/*//from ww w  .j  a v  a 2  s  . c  o m
 * Copyright 2009 Yodlee, Inc.  All Rights Reserved.  Your use of this code 
 * requires a license from Yodlee.  Any such license to this code is 
 * restricted to evaluation/illustrative purposes only. It is not intended 
 * for use in a production environment, and Yodlee disclaims all warranties 
 * and/or support obligations concerning this code, regardless of the terms 
 * of any other agreements between Yodlee and you."
 */
//package com.java2s;
import java.util.Calendar;

public class Main {
    public static void main(String[] argv) throws Exception {
        Calendar calendar = Calendar.getInstance();
        System.out.println(getTimeForFirstDayOfWeek(calendar));
    }

    public static Long getTimeForFirstDayOfWeek(Calendar calendar) {

        Calendar tempCalendar = (Calendar) calendar.clone();
        setTimeAsFirstDayOfWeek(tempCalendar);

        return new Long(tempCalendar.getTimeInMillis());
    }

    public static void setTimeAsFirstDayOfWeek(Calendar calendar) {

        int monthBeforeSet = calendar.get(Calendar.MONTH);
        calendar.set(Calendar.DAY_OF_WEEK, calendar.getFirstDayOfWeek());
        int monthAfterSet = calendar.get(Calendar.MONTH);

        // if year changes setMinimalDaysInFirstWeek for New Year
        if (monthBeforeSet == Calendar.JANUARY
                && monthAfterSet == Calendar.DECEMBER) {
            calendar.setMinimalDaysInFirstWeek(calculateMinimalDaysInFirstWeek(calendar));
        }
        normalise(calendar);
    }

    public static int calculateMinimalDaysInFirstWeek(Calendar calendar) {

        Calendar temp = (Calendar) calendar.clone();
        temp.set(Calendar.DAY_OF_YEAR, 1);
        int firstDayOfJan = temp.get(Calendar.DAY_OF_WEEK);
        return 8 - firstDayOfJan;
    }

    public static void normalise(Calendar calendar) {

        Calendar tempCalendar = (Calendar) calendar.clone();
        calendar.clear();
        calendar.set(Calendar.YEAR, tempCalendar.get(Calendar.YEAR));
        calendar.set(Calendar.DAY_OF_YEAR,
                tempCalendar.get(Calendar.DAY_OF_YEAR));
    }
}

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