Java Date Format Examples

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1.How to compare dates in java
2.How to format date in java

1.How to compare dates in java

package basics;

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

public class DateExamples {

public static void main(String[] args) {
 System.out.println(DateExamples.isDateGreaterThanToday("2/07/2010"));
}

public static boolean isDateGreaterThanToday(String date) {
 boolean results = true;

 DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
 if (date != null && !date.trim().equals("")) {
  try {
   Date dateToBeCompared = dateFormat.parse(date);
   Date today = new Date();
   if (today.compareTo(dateToBeCompared) > 0) {
    results = false;
   }
  } catch (ParseException e) {
   e.printStackTrace();
   results = true;
  }
 }
 return results;
}
}

2.How to format date in java

Symbol	Meaning	Presentation	Example
G	era designator	Text	AD
y	year	Number	2009
M	month in year	Text & Number	July & 07
d	day in month	Number	10
h	hour in am/pm (1-12)	Number	12
H	hour in day (0-23)	Number	0
m	minute in hour	Number	30
s	second in minute	Number	55
S	millisecond	Number	978
E	day in week	Text	Tuesday
D	day in year	Number	189
F	day of week in month	Number	2 (2nd Wed in July)
w	week in year	Number	27
W	week in month	Number	2
a	am/pm marker	Text	PM
k	hour in day (1-24)	Number	24
K	hour in am/pm (0-11)	Number	0
z	time zone	Text	Pacific Standard Time
'	escape for text	Delimiter	(none)
'	single quote	Literal	'

package basics;

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

public class DateFormatExample {

public static void main(String[] args) {

SimpleDateFormat formatter = null;
Date date = new Date();

formatter = new SimpleDateFormat("MM/dd/yy");
String s = formatter.format(date); // Example 07/02/10

System.out.println(s);

formatter = new SimpleDateFormat("dd-MMM-yy");
s = formatter.format(date);// 02-Jul-10
System.out.println(s);

formatter = new SimpleDateFormat("yyyy.MM.dd.HH.mm.ss");
s = formatter.format(date); // 2010.07.02.21.32.35
System.out.println(s);

formatter = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss Z");
s = formatter.format(date); // Fri, 02 Jul 2010 21:32:35 +0800
System.out.println(s);

formatter.applyPattern("EEE, MMM d, ''yy");
s = formatter.format(date); // Fri, Jul 2, '10
System.out.println(s);

formatter.applyPattern("hh 'o''clock' a, zzzz");
s = formatter.format(date); // 09 o'clock PM, Singapore Time
System.out.println(s);

formatter.applyPattern("yyyy.MMMMM.dd GGG hh:mm aaa");
s = formatter.format(date); // 2010.July.02 AD 09:39 PM
System.out.println(s);
}
}