package javatest;

import java.text.SimpleDateFormat;

import java.util.Date;

 class timeTest{

    public static void main(String[] args){

        //获取当前时间

        Date start=new Date();

        //格式化日期、时间

        SimpleDateFormat df=new SimpleDateFormat("yyyyMMddHHmmss");

        //String s=String.format("yyyy-MM-dd", dt);

        String s=df.format(start);

        System.out.println(s);

        //计算时间差

        Date end=new Date();

        long diff = end.getTime() - start.getTime();

        String info=String.format("it takes %f seconds to run.", diff / 1000.00);

        System.out.println(info);

    }

}