Java Internationalization - Date Format Patterns

Quiz

Followings is the use of characters in date formatting patterns.

Sr.No.	Class & Description
1	G To display Era.
2	y To display Year. Valid values yy, yyyy.
3	M To display Month. Valid values MM, MMM or MMMMM.
4	d To display day of month. Valid values d, dd.
5	h To display hour of day (1-12 AM/PM). Valid value hh.
6	H To display hour of day (0-23). Valid value HH.
7	m To display minute of hour (0-59). Valid value mm.
8	s To display second of minute (0-59). Valid value ss.
9	S To display milliseconds of minute (0-999). Valid value SSS.
10	E To display Day in week (e.g Monday, Tuesday etc.)
11	D To display Day in year (1-366).
12	F To display Day of week in month (e.g. 1st Thursday of December).
13	w To display Week in year (1-53).
14	W To display Week in month (0-5)
15	a To display AM / PM
16	k To display Hour in day (1-24).
17	K To display Hour in day, AM / PM (0-11).
18	z To display Time Zone.

Example

In this example, we're formatting dates based on different patterns.

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

public class I18NTester {
   public static void main(String[] args) throws ParseException {

      String pattern = "dd-MM-yy";
      SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
      Date date = new Date();
      System.out.println(simpleDateFormat.format(date));

      pattern = "MM-dd-yyyy";
      simpleDateFormat = new SimpleDateFormat(pattern);
      System.out.println(simpleDateFormat.format(date));

      pattern = "yyyy-MM-dd HH:mm:ss";
      simpleDateFormat = new SimpleDateFormat(pattern);
      System.out.println(simpleDateFormat.format(date));

      pattern = "EEEEE MMMMM yyyy HH:mm:ss.SSSZ";
      simpleDateFormat = new SimpleDateFormat(pattern);
      System.out.println(simpleDateFormat.format(date));
   }
}

Output

It will print the following result.

07-06-24
06-07-2024
2024-06-07 16:04:40
Friday June 2024 16:04:40.866+0530

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