decrement One Month - Java java.util

Java examples for java.util:Month

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Description

decrement One Month

Demo Code

/*//from w  ww. j av 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();
        decrementOneMonth(calendar);
    }

    public static void decrementOneMonth(Calendar calendar) {

        int monthBeforeDecrement = calendar.get(Calendar.MONTH);
        calendar.add(Calendar.MONTH, -1);
        int monthAfterDecrement = calendar.get(Calendar.MONTH);

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

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