DateFormat dalam java

Terkadang kita juga butuh untuk memproses tanggal. sesuai dengan tampilan keinginan kita. dalam java kita bisa memanfaatkan Class java.text.DateFormat dan lain2. berikut ini adalah contoh penggunaannya :

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

public class DateFormatExample1 {

   public static void main(String[] args) {
       // Make a new Date object. It will be initialized to the current time.
       Date now = new Date();

       // See what toString() returns
       System.out.println(" 1. " + now.toString());

       // Next, try the default DateFormat
       System.out.println(" 2. " + DateFormat.getInstance().format(now));

       // And the default time and date-time DateFormats
       System.out.println(" 3. " + DateFormat.getTimeInstance().format(now));
       System.out.println(" 4. " +
           DateFormat.getDateTimeInstance().format(now));

       // Next, try the short, medium and long variants of the
       // default time format
       System.out.println(" 5. " +
           DateFormat.getTimeInstance(DateFormat.SHORT).format(now));
       System.out.println(" 6. " +
           DateFormat.getTimeInstance(DateFormat.MEDIUM).format(now));
       System.out.println(" 7. " +
           DateFormat.getTimeInstance(DateFormat.LONG).format(now));

       // For the default date-time format, the length of both the
       // date and time elements can be specified. Here are some examples:
       System.out.println(" 8. " + DateFormat.getDateTimeInstance(
           DateFormat.SHORT, DateFormat.SHORT).format(now));
       System.out.println(" 9. " + DateFormat.getDateTimeInstance(
           DateFormat.MEDIUM, DateFormat.SHORT).format(now));
       System.out.println("10. " + DateFormat.getDateTimeInstance(
           DateFormat.LONG, DateFormat.LONG).format(now));
   }
}

Hasil

> java DateFormatExample1
1. Tue Nov 04 20:14:11 EST 2003
2. 11/4/03 8:14 PM
3. 8:14:11 PM
4. Nov 4, 2003 8:14:11 PM
5. 8:14 PM
6. 8:14:11 PM
7. 8:14:11 PM EST
8. 11/4/03 8:14 PM
9. Nov 4, 2003 8:14 PM
10. November 4, 2003 8:14:11 PM EST

Terkadang juga kita butuh mendapatkan nilai tanggal dari input data String. nah kita bisa manfaatin class tadi juga. caranya kayak gini nech

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

public class DateFormatExample2 {

   public static void main(String[] args) {
       // Make a String that has a date in it, with MEDIUM date format
       // and SHORT time format.
       String dateString = "Nov 4, 2003 8:14 PM";

       // Get the default MEDIUM/SHORT DateFormat
       DateFormat format =
           DateFormat.getDateTimeInstance(
           DateFormat.MEDIUM, DateFormat.SHORT);

       // Parse the date
       try {
           Date date = format.parse(dateString);
           System.out.println("Original string: " + dateString);
           System.out.println("Parsed date    : " +
                date.toString());
       }
       catch(ParseException pe) {
           System.out.println("ERROR: could not parse date in string \"" +
               dateString + "\"");
       }
   }
}

Hasil

> java DateFormatExample2
Original string: Nov 4, 2003 8:14 PM
Parsed date    : Tue Nov 04 20:14:00 EST 2003