Java - format current date time with milliseconds pattern eg: yyyy-MM-dd HH:mm:ss.milliseconds

1. Overview

In java we can display current date time with milliseconds pattern when we use SSS pattern.

eg:

yyyy-MM-dd HH:mm:ss.SSS

2. LocalDateTime - current time with milliseconds - Java 8

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Example1 {

    public static void main(String[] args) {

        DateTimeFormatter fmt = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
        LocalDateTime localDateTime = LocalDateTime.now();

        String format = fmt.format(localDateTime);
        System.out.println(format); // 2019-10-13 12:56:53.220
    }
}

Output: 

2019-10-13 12:56:53.220

3. ZonedDateTime - current time with milliseconds - Java 8

import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;

public class Example2 {

    public static void main(String[] args) {

        DateTimeFormatter fmt = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS Z");
        ZonedDateTime zonedDateTime = ZonedDateTime.now();

        String format = fmt.format(zonedDateTime);
        System.out.println(format); // 2019-10-13 13:07:10.912 +0200
    }
}

Output: 

2019-10-13 13:07:10.912 +0200

4. Date - current time with milliseconds

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

public class Example3 {

    public static void main(String[] args) {

        SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
        Date date = new Date();

        String format = fmt.format(date);
        System.out.println(format); // 2019-10-13 12:57:05.053
    }
}

Output: 

2019-10-13 12:57:05.053

5. Calendar - current time with milliseconds

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class Example4 {

    public static void main(String[] args) {

        SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
        Calendar calendar = Calendar.getInstance();

        String format = fmt.format(calendar.getTime());
        System.out.println(format); // 2019-10-13 12:57:14.897
    }
}

Output: 

2019-10-13 12:57:14.897

Merged questions

1. Java - display current time with milliseconds

References

1. DateTimeFormatter - JavaDoc
2. LocalDateTime - JavaDoc
3. Date - JavaDoc
4. SimpleDateFormat - JavaDoc
5. Calendar - JavaDoc
6. ZonedDateTime - JavaDoc