1.Date的getTime方法，来获取时间，然后对两个时间进行比较。
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SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date oldDate1 = format.parse("2017-03-12 59:16:00");
Date oldDate2 = format.parse("2018-02-06 23:16:00");
if(d1.getTime() > d2.getTime()){
return 1;
}else if(d1.getTime() < d2.getTime()){
return -1;
}else{
return 0;
}
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SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date oldDate1 = format.parse("2017-03-12 59:16:00");
Date oldDate2 = format.parse("2018-02-06 23:16:00");
long day=num/(24*60*60*1000);
long hour=(num/(60*60*1000)-day*24);
long min=((num/(60*1000))-day*24*60-hour*60);
long s=(num/1000-day*24*60*60-hour*60*60-min*60);
System.out.println(""+day+"天"+hour+"小时"+min+"分"+s+"秒");
2.Date中compareTo的用法。也是比较时间大小的，相等返回0，大于返回1，小于返回-1
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SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date oldDate1 = format.parse("2017-03-12 59:16:00");
Date oldDate2 = format.parse("2018-02-06 23:16:00");
System.out.println(oldDate1.compareTo(oldDate2));