java中时间比较

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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)   {   }  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");     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=between%3600/60;      long second1=between%60/60;       System.out.println(""+day1+"天"+hour1+"小时"+minute1+"分"+second1+"秒");     ==================================================== 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");   else  System.out.println("c1大于c2");  //时间格式转换FastDateFormat df = FastDateFormat.getInstance("yyyy-MM-dd HH:mm:ss");   String date = df.format(java.util.Date());
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