Write a program that converts dates from numerical month/day/year format to norm

Question

Write a program that converts dates from numerical month/day/year format to normal “month day, year” format (for example, 12/25/2000 corresponds to December 25, 2000). You will define three exception classes, one called MonthException, another called DayException, and a third called YearException. If the user enters anything other than a legal month number (integers from 1 to 12), your program will throw and catch a MonthException and ask the user to reenter the month. Similarly, if the user enters anything other than a valid day number (integers from 1 to either 28, 29, 30, or 31, depending on the month and year), then your program will throw and catch a DayException and ask the user to reenter the day. If the user enters a year that is not in the range 1000 to 3000 (inclusive), then your program will throw and catch a YearException and ask the user to reenter the year. (There is nothing very special about the numbers 1000 and 3000 other than giving a good range of likely dates.)

Explanation / Answer

here is your files : ---------->>>>>>>>

MonthException.java : -------------

public class MonthException extends Exception{
public MonthException(String str){
  super(str);
}
}

DayException.java : --------------

public class DayException extends Exception{
public DayException(String str){
  super(str);
}
}

YearException.java : -----------------------

public class YearException extends Exception{
public YearException(String str){
  super(str);
}
}

ConvertDates.java : -------------->>>>>>

import java.util.Scanner;

public class ConvertDates{
public static String checkMonth(int month)throws MonthException{
  String[] months = {"January","February","March","April","May","June","July","August","September","October","November","December"};
  if(month < 1 || month > 12){
   throw new MonthException("Not a valid Month !!!");
  }
  return months[month-1];
}
public static void checkYear(int ye)throws YearException{
  if(ye < 1000 || ye > 3000){
   throw new YearException("Invalid Year !!! ");
  }
}
public static void checkDay(int d,int val)throws DayException{
  if(d < 1 || d > val){
   throw new DayException("Invalid Day !!! ");
  }
}
public static String convert(String dates){
  String[] str = dates.split("/");
  String mn = null;
  int iy = Integer.parseInt(str[2]);
  boolean st = true;
  Scanner sc = new Scanner(System.in);
  while(st){
   try{
    checkYear(iy);
    st = false;
   }catch(YearException e){
    System.out.println(e);
    System.out.println("Enter a valid Year (1000-3000) : ");
    iy = sc.nextInt();
    st = true;
   }catch(Exception e){
    System.out.println(e);
    System.out.println("Enter a valid year (1000-3000) : ");
    iy = sc.nextInt();
    st = true;
   }
  }
  int imn = Integer.parseInt(str[0]);
  st = true;
  while(st){
   try{
    mn = checkMonth(imn);
    st = false;
   }catch(MonthException e){
    System.out.println(e);
    System.out.println("Enter a valid month (1-12) : ");
    imn = sc.nextInt();
    st = true;
   }catch(Exception e){
    System.out.println(e);
    System.out.println("Enter a valid month (1-12) : ");
    imn = sc.nextInt();
    st = true;
   }
  }
  int id = Integer.parseInt(str[1]);
  int vd = 0;
  st = true;
  if(imn == 1 || imn == 3 || imn == 5 || imn == 7 || imn == 8 || imn == 10 || imn == 12){
   vd = 31;
  }else if(imn == 4 || imn == 6 || imn == 9 || imn == 11){
   vd = 30;
  }else if(imn == 2){
   if(iy%100 == 0 && iy % 400 == 0){
    vd = 29;
   }else if(iy%100 != 0 && iy % 4 == 0){
    vd = 29;
   }else{
    vd = 28;
   }
  }
  while(st){
   try{
    checkDay(id,vd);
    st = false;
   }catch(DayException e){
    System.out.println(e);
    System.out.println("Enter a valid Day (1-"+vd+") : ");
    id = sc.nextInt();
    st = true;
   }catch(Exception e){
    System.out.println(e);
    System.out.println("Enter a valid day (1-"+vd+") : ");
    id = sc.nextInt();
    st = true;
   }
  }

  return mn+" "+id+", "+iy;
}

public static void main(String[] args) {
  Scanner sc = new Scanner(System.in);
  String date = null;
  System.out.println("Enter a date (mm/dd/yyyy) format ");
  date = sc.next();
  date = convert(date);
  System.out.println("Formated Date : "+date);
}
}

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