java 获取两个日期相差多少天

悠悠 2022-12-20 06:26 209阅读 0赞

date1="1987-01-01"

date2="2010-01-01"

import java.text.ParseException;
    
    import java.text.SimpleDateFormat;
    
    import java.util.Calendar;
    
    import java.util.Date;
    
    public class test16 {
    
    /**
    
    * @param args java项目www.fhadmin.org
    
    * @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"));
    
    }
    
    /**java项目www.fhadmin.org
    
    * 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
    
    {
        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));
    
        }
    
    }