package zhouls.bigdata.DataFeatureSelection.sim;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

public class GetIntervalDays {

    public static void main(String[] args) throws ParseException {

        String s1 = "2017-01-16 22:28:11.0";

        String s2 = "2017-04-03 16:49:57.0";

        Date d1 = parseDate(s1);//解析成Date类型

        Date d2 = parseDate(s2);//解析成Date类型

        System.out.println(d1);//Mon Jan 16 22:28:11 CST 2017

        System.out.println(d2);//Mon Apr 03 16:49:57 CST 2017

        System.out.println(getIntervalDays(d1,d2));//相差的天数76

    }

    /**

     * 把字符串解析成日期

     * @param s

     * @return d

     * @throws ParseException

     */

    public static Date parseDate(String s) throws ParseException {

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");

        Date d = sdf.parse(s);

        return d;

    }

    /**

     * 相差天数（隔24小时为相差1天，否则为0天）

     * @param fDate

     * @param oDate

     * @return d

     */

    public static int getIntervalDays(Date fDate, Date oDate) {

        if (null == fDate || null == oDate) {

            return -;

        }

        long intervalMilli = oDate.getTime() - fDate.getTime();

        return (int) (intervalMilli / ( *  *  * ));

    }

}