Java Time Comparison tool class sharing

Development often need to compare time, write a simple tool class, share:

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package com.ijiuyuan.common.utils;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class DiffTime {    public static void main(String[] args){                SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        Date startTime = null;        Date endTime = null;        try {            startTime = sdf.parse("2014-06-24 10:19:40");            endTime=sdf.parse("2014-06-16 10:19:40");        } catch (ParseException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }                long nd = 1000 * 24 * 60 * 60;// 一天的毫秒数        long md = 1000 * 1 * 1 * 60;// 分钟的毫秒数        long sd = 1000 * 1 * 1 * 1;// 毫秒数        long diff =startTime.getTime()- new Date().getTime() ;                long day = diff / nd;// 计算差多少天        long minute=diff/md;        long second=diff/sd;        System.out.println(second);        if(diff>=nd*7){            System.out.println("预备中:"+second);        }                long endday = (endTime.getTime()- new Date().getTime()) / md;// 计算差多少天                         System.out.println(endday);                if (day <= 7 && day >= 0) {                                     if(minute>=0)                System.out.println("即将开始");            else {                System.out.println("已结束");            }        } else if (day > 7) {            System.out.println("预备中");        } else {            System.out.println("已结束");        }     }    /**     * 时间比较     * <p>     * 如果第一个时间大于第二时间返回1<br/>     * 等于返回0<br/>     * 小于返回-1     * </p>     * @param firstTime     * @param secondTime     * @return     */    public static int compare(Date firstTime,Date secondTime){        long diff =firstTime.getTime()- secondTime.getTime() ;        if(diff>0){            return 1;        }else if(diff==0){            return 0;        }else{            return -1;        }    }    /**     * 是否值过大     * @param firstTime     * @return     */    public static boolean isTooLarge(Date firstTime){        Calendar calendar=Calendar.getInstance();        calendar.setTime(new Date());        calendar.add(Calendar.YEAR, 1000);        Date bigDate=calendar.getTime();        if(compare(firstTime, bigDate)>0){            return true;        }else{            return false;        }    }}

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Java Time Comparison tool class sharing