Java Date Previous getPreviousQuarterStartDate(Date dt)

Description

Gets the start date for the previous quarter

License

Open Source License

Parameter

Parameter	Description
dt	a parameter

Return

the date

Declaration

public static Date getPreviousQuarterStartDate(Date dt) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

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

public class Main {
    public static final String AM = "AM";

    /**/*  ww w.  ja v a  2  s .  co  m*/
     * Gets the start date for the previous quarter
     * 
     * @param dt
     * @return the date
     */
    public static Date getPreviousQuarterStartDate(Date dt) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(dt);
        int calMonth = cal.get(Calendar.MONTH);
        int calMonthMod = (calMonth) % 3;
        cal.add(Calendar.MONTH, -(calMonthMod + 3));
        cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.DAY_OF_MONTH));
        return dayStart(cal.getTime());
    }

    /**
     * Set a Date dt to the start of the day, with the hour, minute, second and
     * millisecods all zeros(AM). This could be used for possible scheduling.
     * 
     * @param dt
     *            The given Date
     * 
     * @return date The day end Date for the given date
     */
    public static Date dayStart(Date dt) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(dt);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.get(Calendar.HOUR_OF_DAY);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        cal.set(Calendar.AM_PM, Calendar.AM);

        return cal.getTime();
    }
}

Related

1. getPreviousFriday(final Date d)
2. getPreviousMonday(Date day)
3. getPreviousMonth(Date time)
4. getPreviousMonth(long date)
5. getPreviousMonthFirst(Date appointDate)
6. getPreviuosRoundMonth(Date baseDate)
7. previousDay(Date date)
8. previousDay(long date)
9. previousDay(long date)