计算两个日期的天数间隔

import java.text.ParseException;   
import java.text.SimpleDateFormat;   
import java.util.Calendar;   
import java.util.Date;   
  
  
public class DateTest {     
        public static void main(String[] args) {          
        SimpleDateFormat sf=new SimpleDateFormat("yyyyMMdd");   
     try {   
        Date date=sf.parse("20090125");   
         Calendar cl=Calendar.getInstance();   
          cl.setTime(date);   
          int year1=cl.get(Calendar.YEAR);   
         int day1= cl.get(Calendar.DAY_OF_YEAR );   
         Date date2= sf.parse("20110725");   
          Calendar c2=Calendar.getInstance(); 
         c2.setTime(date);    
          int year2=c2.get(Calendar.YEAR);   
         int day2= c2.get(Calendar.DAY_OF_YEAR);   
         System.out.println((year2-year1)*365+(day2-day1));   
    } catch (ParseException e) {   
        // TODO Auto-generated catch block   
        e.printStackTrace();   
    }   
           
    }   
  
}  

 

   计算任意两个日期的天数差，一次类推，年、月、时、分、秒也可以的