Write a program to find out the difference (in number of days) between given two dates in dd/mm/yyyy format

import java.util.Calendar;
 
public class DateDifferent
{    
    public static void main(String[] args)
	{
		Calendar calendar1 = Calendar.getInstance();
		Calendar calendar2 = Calendar.getInstance();
		
		calendar1.set(21, 01, 2008);
		calendar2.set(18, 02, 2008);
		
		long milliseconds1 = calendar1.getTimeInMillis();
		long milliseconds2 = calendar2.getTimeInMillis();
		long diff = milliseconds2 - milliseconds1;
		long diffDays = diff / (24 * 60 * 60 * 1000);
		
		System.out.println("\nThe Date Different Example");
		System.out.println("Time in days: " + diffDays + " days.");
  }
}