Java计算两个日期相差的天数

悠悠 2022-10-10 11:26 376阅读 0赞

import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    
    
    public class test16 { 
    
        /** * @param args * @throws ParseException */
        public static void main(String[] args) throws ParseException { 
            // TODO Auto-generated method stub
            SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date d1=sdf.parse("2012-09-08 10:10:10");
            Date d2=sdf.parse("2012-09-15 00:00:00");
            System.out.println(daysBetween(d1,d2));
    
            System.out.println(daysBetween("2012-09-08 10:10:10","2012-09-15 00:00:00"));
        }
        
        /** * 计算两个日期之间相差的天数 * @param smdate 较小的时间 * @param bdate 较大的时间 * @return 相差天数 * @throws ParseException */  
        public static int daysBetween(Date smdate,Date bdate) throws ParseException  
        {   
            SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
            smdate=sdf.parse(sdf.format(smdate));
            bdate=sdf.parse(sdf.format(bdate));
            Calendar cal = Calendar.getInstance();  
            cal.setTime(smdate);  
            long time1 = cal.getTimeInMillis();               
            cal.setTime(bdate);  
            long time2 = cal.getTimeInMillis();       
            long between_days=(time2-time1)/(1000*3600*24);
              
           return Integer.parseInt(String.valueOf(between_days));         
        }  
        
    　　/** 　　 *字符串的日期格式的计算 　　 */
        public static int daysBetween(String smdate,String bdate) throws ParseException{ 
            SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
            Calendar cal = Calendar.getInstance();  
            cal.setTime(sdf.parse(smdate));  
            long time1 = cal.getTimeInMillis();               
            cal.setTime(sdf.parse(bdate));  
            long time2 = cal.getTimeInMillis();       
            long between_days=(time2-time1)/(1000*3600*24);
              
           return Integer.parseInt(String.valueOf(between_days));   
        }
    
    }