Java计算两个日期相差的天数-蒲公英云

Java计算两个日期相差的天数

悠悠 2022-10-10 11:26 350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));   
    }
}