import org.testng.annotations.Test;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;public class TestDate {    @Test    public void test01() throws ParseException {        Date dt= new Date();        long s=System.currentTimeMillis();        long long1= 1533954986837L;        SimpleDateFormat dtf = new SimpleDateFormat("yyyy-MM-dd");        SimpleDateFormat dtf1 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss@SSS");        String sdate =dtf1.format(long1);        System.out.println(sdate);        System.out.println(dtf.format(dt));        System.out.println(dtf1.format(dt));        System.out.println(dtf1.format(dt).toString());        // Date -> String        Date date = new Date(System.currentTimeMillis());        System.out.println(dtf.format(date));        // String -> Date        String timeString = "2018-08-11 11:44:27";        Date newDate = dtf.parse(timeString);        System.out.println(newDate);    }}