dateutil.java

来自「《java敏捷开发--使用spring、hibernate和eclipse》源码」· Java 代码 · 共 83 行

package com.visualpatterns.timex.util;

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

/**
 * Date utility class.
 * @author anil
 */
public class DateUtil
{
    /**
     * Returns date for Sunday of current week.
     */
    public static Date getCurrentPeriodEndingDate()
    {
        // loop forward till we find SUNDAY
        GregorianCalendar gc = new GregorianCalendar();
        while (gc.get(GregorianCalendar.DAY_OF_WEEK) != GregorianCalendar.SUNDAY)
            gc.add(GregorianCalendar.DATE, 1);

        return gc.getTime();
    }

    /** 
     * Returns date for Monday of current week 
     */
    public static Date getCurrentPeriodStartingDate()
    {
        // loop backward till we find MONDAY
        GregorianCalendar gc = new GregorianCalendar();
        while (gc.get(GregorianCalendar.DAY_OF_WEEK) != GregorianCalendar.MONDAY)
            gc.add(GregorianCalendar.DATE, -1);

        return gc.getTime();
    }

    /**
     * Returns date parameter with time components zeroed out
     */
    public static Date getDateWithZeroTime(Date date)
    {
        Calendar modifiedDate = new GregorianCalendar();
        modifiedDate.setTime(date);
        modifiedDate.set(Calendar.HOUR_OF_DAY, 0);
        modifiedDate.set(Calendar.MINUTE, 0);
        modifiedDate.set(Calendar.SECOND, 0);
        modifiedDate.set(Calendar.MILLISECOND, 0);

        return modifiedDate.getTime();
    }

    /**
     * Returns date parameter with time components set to maximum
     * values for day (that is, 11:59:59.999)
     */
    public static Date getDateWithMaxTime(Date date)
    {
        Calendar modifiedDate = new GregorianCalendar();
        modifiedDate.setTime(date);
        modifiedDate.set(Calendar.HOUR_OF_DAY, 23);
        modifiedDate.set(Calendar.MINUTE, 59);
        modifiedDate.set(Calendar.SECOND, 59);
        modifiedDate.set(Calendar.MILLISECOND, 999);

        return modifiedDate.getTime();
    }

    /**
     * Determines if checkDate falls in current week (from current
     * Monday till Sunday)
     */
    public static boolean isInCurrentPayPeriod(Date checkDate)
    {
        Date weekStartDate = getDateWithZeroTime(getCurrentPeriodStartingDate());
        Date weekEndDate = getDateWithMaxTime(getCurrentPeriodEndingDate());

        return (!checkDate.before(weekStartDate) && !checkDate
                .after(weekEndDate));
    }
}