date @Test SimpleDateFormat

import java.text.DateFormat;
import org.junit.Test;
import java.util.Date;

 @Test
    public void sss(){
        System.out.println(DateFormat.getDateTimeInstance().format(new Date()));
    }

2019-3-22 14:47:55

@Test
    public void sss(){
        System.out.println(DateFormat.getDateInstance().format(new Date()));
    }

2019-3-22

@Test
    public void sss(){
        System.out.println(DateFormat.getTimeInstance().format(new Date()));
    }

11:08:20

@Test
    public void sss(){
        System.out.println(DateFormat.getInstance().format(new Date()));
    }

19-3-26 上午11:10

import java.text.SimpleDateFormat;
import java.util.Date;

@Test
    public void d(){
        System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS").format(new Date()));
    }

yyyy-MM-dd HH:mm:ss

System.out.println(System.currentTimeMillis());
        System.out.println(new Date().getTime());

1553568915029
1553568915029

System.out.println(new SimpleDateFormat("yyyy-MM-dd E a HH:mm:ss").format(new Date()));

2019-03-26 星期二 上午 10:57:58