How to Use DateFormat Class in Java


Use getDateInstance to get the normal date format for that country. For example,
import java.text.DateFormat;
import java.util.Date;

public class DateFormatExample {

    public static void main(String[] args) {
        
        Date now = new Date();

        DateFormat defaultDf = DateFormat.getDateInstance();
        DateFormat shortDf = DateFormat.getDateInstance(DateFormat.SHORT);
        DateFormat mediumDf = DateFormat.getDateInstance(DateFormat.MEDIUM);
        DateFormat longDf = DateFormat.getDateInstance(DateFormat.LONG);
        DateFormat fullDf = DateFormat.getDateInstance(DateFormat.FULL);
        
        System.out.println(" 1. " + defaultDf.format(now));
        System.out.println(" 2. " + shortDf.format(now));
        System.out.println(" 3. " + mediumDf.format(now));
        System.out.println(" 4. " + longDf.format(now));
        System.out.println(" 5. " + fullDf.format(now));
    }
}
The output is
 1. Jun 20, 2008
 2. 6/20/08
 3. Jun 20, 2008
 4. June 20, 2008
 5. Friday, June 20, 2008

Use getTimeInstance to get the time format for that country. For example,
import java.text.DateFormat;
import java.util.Date;

public class DateFormatExample {

    public static void main(String[] args) {
        
        Date now = new Date();

        DateFormat defaultDf = DateFormat.getTimeInstance();
        DateFormat shortDf = DateFormat.getTimeInstance(DateFormat.SHORT);
        DateFormat mediumDf = DateFormat.getTimeInstance(DateFormat.MEDIUM);
        DateFormat longDf = DateFormat.getTimeInstance(DateFormat.LONG);
        DateFormat fullDf = DateFormat.getTimeInstance(DateFormat.FULL);
        
        System.out.println(" 1. " + defaultDf.format(now));
        System.out.println(" 2. " + shortDf.format(now));
        System.out.println(" 3. " + mediumDf.format(now));
        System.out.println(" 4. " + longDf.format(now));
        System.out.println(" 5. " + fullDf.format(now));
    }
}
The output is
 1. 10:09:12 PM
 2. 10:09 PM
 3. 10:09:12 PM
 4. 10:09:12 PM EDT
 5. 10:09:12 PM EDT

Use getDateTimeInstance to get a date and time format. For example,
import java.text.DateFormat;
import java.util.Date;

public class DateFormatExample {

    public static void main(String[] args) {
        Date now = new Date();

        DateFormat defaultDf = DateFormat.getDateTimeInstance();
        DateFormat shortDf = DateFormat.getDateTimeInstance(
               DateFormat.SHORT, DateFormat.SHORT);
        DateFormat mediumDf = DateFormat.getDateTimeInstance(
               DateFormat.MEDIUM, DateFormat.SHORT);
        DateFormat longDf = DateFormat.getDateTimeInstance(
               DateFormat.LONG, DateFormat.SHORT);
        DateFormat fullDf = DateFormat.getDateTimeInstance(
               DateFormat.FULL, DateFormat.SHORT);
        
        System.out.println("  1. " + defaultDf.format(now));
        System.out.println("  2. " + shortDf.format(now));
        System.out.println("  3. " + mediumDf.format(now));
        System.out.println("  4. " + longDf.format(now));
        System.out.println("  5. " + fullDf.format(now));
        System.out.println("============================");
        shortDf = DateFormat.getDateTimeInstance(DateFormat.SHORT, 
              DateFormat.MEDIUM);
        mediumDf = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, 
              DateFormat.MEDIUM);
        longDf = DateFormat.getDateTimeInstance(DateFormat.LONG, 
              DateFormat.MEDIUM);
        fullDf = DateFormat.getDateTimeInstance(DateFormat.FULL, 
              DateFormat.MEDIUM);
   
        System.out.println("  6. " + shortDf.format(now));
        System.out.println("  7. " + mediumDf.format(now));
        System.out.println("  8. " + longDf.format(now));
        System.out.println("  9. " + fullDf.format(now));
        System.out.println("============================");
        
        shortDf = DateFormat.getDateTimeInstance(DateFormat.SHORT, 
              DateFormat.LONG);
        mediumDf = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, 
              DateFormat.LONG);
        longDf = DateFormat.getDateTimeInstance(DateFormat.LONG, 
              DateFormat.LONG);
        fullDf = DateFormat.getDateTimeInstance(DateFormat.FULL, 
             DateFormat.LONG);
   
        System.out.println(" 10. " + shortDf.format(now));
        System.out.println(" 11. " + mediumDf.format(now));
        System.out.println(" 12. " + longDf.format(now));
        System.out.println(" 13. " + fullDf.format(now));
        System.out.println("============================");

        shortDf = DateFormat.getDateTimeInstance(DateFormat.SHORT, 
                DateFormat.FULL);
        mediumDf = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, 
                DateFormat.FULL);
        longDf = DateFormat.getDateTimeInstance(DateFormat.LONG, 
                DateFormat.FULL);
        fullDf = DateFormat.getDateTimeInstance(DateFormat.FULL, 
                DateFormat.FULL);
   
        System.out.println(" 14. " + shortDf.format(now));
        System.out.println(" 15. " + mediumDf.format(now));
        System.out.println(" 16. " + longDf.format(now));
        System.out.println(" 17. " + fullDf.format(now));

    }

}
The output is
  1. Jun 21, 2008 9:30:41 PM
  2. 6/21/08 9:30 PM
  3. Jun 21, 2008 9:30 PM
  4. June 21, 2008 9:30 PM
  5. Saturday, June 21, 2008 9:30 PM
============================
  6. 6/21/08 9:30:41 PM
  7. Jun 21, 2008 9:30:41 PM
  8. June 21, 2008 9:30:41 PM
  9. Saturday, June 21, 2008 9:30:41 PM
============================
 10. 6/21/08 9:30:41 PM EDT
 11. Jun 21, 2008 9:30:41 PM EDT
 12. June 21, 2008 9:30:41 PM EDT
 13. Saturday, June 21, 2008 9:30:41 PM EDT
============================
 14. 6/21/08 9:30:41 PM EDT
 15. Jun 21, 2008 9:30:41 PM EDT
 16. June 21, 2008 9:30:41 PM EDT
 17. Saturday, June 21, 2008 9:30:41 PM EDT

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