How to use SimpleDateFormat?

Letter	Date or Time Component	Presentation	Examples
G	Era designator	Text	AD
y	Year	Year	1996; 96
M	Month in year	Month	July; Jul; 07
w	Week in year	Number	27
W	Week in month	Number	2
D	Day in year	Number	189
d	Day in month	Number	10
F	Day of week in month	Number	2
E	Day in week	Text	Tuesday; Tue
a	Am/pm marker	Text	PM
H	Hour in day (0-23)	Number	0
k	Hour in day (1-24)	Number	24
K	Hour in am/pm (0-11)	Number	0
h	Hour in am/pm (1-12)	Number	12
m	Minute in hour	Number	30
s	Second in minute	Number	55
S	Millisecond	Number	978
z	Time zone	General time zone	Pacific Standard Time; PST; GMT-08:00
Z	Time zone	RFC 822 time zone	-0800

package rhymes.dateformat;

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

public class DateFormatExample {

 /**
  * @param args
  */
 public static void main(String[] args) {
  String format[] = { "yyyy.MM.dd G 'at' HH:mm:ss z",
    "MM/dd/yyyy hh:mm:ss a z", "MM/dd/yyyy kk:mm:ss z",
    "EEE, MMM d, ''yy", "h:mm a", "hh 'o''clock' a, zzzz",
    "K:mm a, z", "yyyyy.MMMMM.dd GGG hh:mm aaa",
    "EEE, d MMM yyyy HH:mm:ss Z", "yyMMddHHmmssZ" };
  Date today = new Date();
  for (int i = 0; i lt; format.length; i++) {
   SimpleDateFormat formatter = new SimpleDateFormat(format[i]);
   System.out.println("\"" + format[i] + "\"   :  "
     + formatter.format(today));
  }
 }

}

5:45 PM

"yyyy.MM.dd G 'at' HH:mm:ss z"	2008.06.17 AD at 17:45:18 IST
"MM/dd/yyyy hh:mm:ss a z"	06/17/2008 05:45:18 PM IST
"MM/dd/yyyy kk:mm:ss z"	06/17/2008 17:45:18 IST
"EEE, MMM d, ''yy"	Tue, Jun 17, '08
"h:mm a"
"hh 'o''clock' a, zzzz"	05 o'clock PM, India Standard Time
"K:mm a, z"	5:45 PM, IST
"yyyyy.MMMMM.dd GGG hh:mm aaa"	02008.June.17 AD 05:45 PM
"EEE, d MMM yyyy HH:mm:ss Z"	Tue, 17 Jun 2008 17:45:18 +0530
"yyMMddHHmmssZ"	080617174518+0530