java 获取 两个日期 相差多少天

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));

    }

}

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