import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

public class TimeTest {

public static void main(String[] args) {

// get current unixno(ms)

System.out.println(System.currentTimeMillis());

System.out.println(Calendar.getInstance().getTimeInMillis());

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

// get current unix(s)

System.out.println(System.currentTimeMillis() / 1000);

System.out.println(Calendar.getInstance().getTimeInMillis() / 1000);

System.out.println(new Date().getTime() / 1000);

// get time

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");

// out string

System.out.println(df.format(new Date()));

df.getCalendar();

// get time to unix

try {

System.out.println(new SimpleDateFormat("yyyy/MM/dd HH:mm:ss:SSS").parse("2017/11/11 11:11:11:111").getTime());

} catch (ParseException e) {

e.printStackTrace();

}

}

}