java计算时间差

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现在是2004-03-26 13:31:40
过去是:2004-01-02 11:30:24
要获得两个日期差,差的形式为:XX天XX小时XX分XX秒

方法一:

DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try{    Date d1 = df.parse("2004-03-26 13:31:40");    Date d2 = df.parse("2004-01-02 11:30:24");    long diff = d1.getTime() - d2.getTime();    long days = diff / (1000 * 60 * 60 * 24);}catch (Exception e){}
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方法二:

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");java.util.Date now = df.parse("2004-03-26 13:31:40");java.util.Date date=df.parse("2004-01-02 11:30:24");long l=now.getTime()-date.getTime();long day=l/(24*60*60*1000);long hour=(l/(60*60*1000)-day*24);long min=((l/(60*1000))-day*24*60-hour*60);long s=(l/1000-day*24*60*60-hour*60*60-min*60);System.out.println(""+day+"天"+hour+"小时"+min+"分"+s+"秒");
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SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");java.util.Date now = df.parse("2004-03-26 13:31:40");java.util.Date date=df.parse("2004-01-02 11:30:24");long l=now.getTime()-date.getTime();long day=l/(24*60*60*1000);long hour=(l/(60*60*1000)-day*24);long min=((l/(60*1000))-day*24*60-hour*60);long s=(l/1000-day*24*60*60-hour*60*60-min*60);System.out.println(""+day+"天"+hour+"小时"+min+"分"+s+"秒");

方法三:

SimpleDateFormat dfs = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); java.util.Date begin=dfs.parse("2004-01-02 11:30:24"); java.util.Date end = dfs.parse("2004-03-26 13:31:40"); long between=(end.getTime()-begin.getTime())/1000;//除以1000是为了转换成秒  long day1=between/(24*3600); long hour1=between%(24*3600)/3600; long minute1=between600/60; long second1=between`/60; System.out.println(""+day1+"天"+hour1+"小时"+minute1+"分"+second1+"秒");
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java 比较时间大小

String s1="2008-01-25 09:12:09";String s2="2008-01-29 09:12:11";java.text.DateFormat df=new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");java.util.Calendar c1=java.util.Calendar.getInstance();java.util.Calendar c2=java.util.Calendar.getInstance();try{c1.setTime(df.parse(s1));c2.setTime(df.parse(s2));}catch(java.text.ParseException e){System.err.println("格式不正确");}int result=c1.compareTo(c2);if(result==0)System.out.println("c1相等c2");else if(result<0)System.out.println("c1小于c2");elseSystem.out.println("c1大于c2");


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