//An instance of this class represents a Gregorian Calendar date
// 1582 or later
public class CalendarDate
{
   public enum DateFormat
   {
      STANDARD,   //3 August 2012
      US_FORMAT,  //Aug 3, 2012
      ISO_8601;   //2012-08-03
   }
   
   //Instance (State) Variables
   private CalendarYear year;   //A Calendar year
   private CalendarMonth month; //A Calendar month
   private CalendarDay day;     //1 .. 28/29/30/31
   private DateFormat format;    //Display format
   
   //Constructor
   public CalendarDate(int day, int month, int year)
   {
      this.format = DateFormat.STANDARD;
   }
   
   //Accessors
   
   
     
   //Mutator
   public void setFormat(CalendarDate.DateFormat format)
   {
      this.format = format;
   }
   
   //Override
   //The format of the returned image of this CalendarDate 
   //is determined by the value of instance variable format
   public String toString()
   {
      switch ( this.format )
      {
         case STANDARD  :  
         case US_FORMAT :  
         case ISO_8601  :  
         default        :  return "07/01/2015";
      }
   }
   
   //Helper
   private static String twoDigits(int number)
   {
      return (number < 10 ? "0" : "") + number;
   }
   
   //Compare this CalendarDate with an other CalendarDate
   // Returns  0 if the dates are identical
   //          any negative number if this precedes other
   //          any positive number if this succeeds other
   public int compareTo(CalendarDate other)
   {
            return 0;
   }
   
   //Returns the ordinal (day-number)of this CalendarDate
   // Jan 1 has ordinal 1, Jan 31 has ordinal 31
   // Feb 1 has ordinal 32, Feb 28 has ordinal 39
   // Mar 1 has ordinal 40 in an ordinary year, 
   //                   41 in a leap year
   // Dec 31 has ordinal 365 in an ordinary year,
   //                    366 in a leap year
   public int ordinal()
   {
      return 0;
   }
   
   //Return the anniversary date in another year of this CalendarDate
   // Example, the 2015 anniversary date of 05/18/1995 is 05/18/2015
   // @param year: the anniversary year
   public CalendarDate anniversary(CalendarYear year)
   {
      return this;
   }     
   
}