Program to print the day of the date entered by the user in the form of dd-MON-2014 for the year 2014 only.

/* Program to print the day of the date entered by the user
in the form of dd-MON-2014 for the year 2014 only */

import java.io.*;
public class dayofdate
{
    public static void main(String args[])throws IOException
    {
        InputStreamReader read = new InputStreamReader(System.in);
        BufferedReader in = new BufferedReader(read);
        String dt = "", dd, mnth;
        int dd1, res;
        System.out.println("Enter the date : (dd-MON-2014)");
        dt=in.readLine();
        //fetching the dd of the given date
        dd=dt.substring(0,2);
        dd1=Integer.parseInt(dd);      
        res=dd1%7;
       
        //fetching the mon of the given date
        mnth=dt.substring(3,6);
        mnth=mnth.toUpperCase();
     
        // Fetching the day for the month of January or October
        if(mnth.equals("JAN") || mnth.equals("OCT"))
        {
            if(dd1>0 && dd1<=31)
            {
            if(res==1)
                System.out.println(dt + " is Wednesday. ");
            else if(res==2)
                System.out.println(dt + " is Thursday. ");
            else if(res==3)
                System.out.println(dt + " is Friday. ");
            else if(res==4)
                System.out.println(dt + " is Saturday. ");
            else if(res==5)
                System.out.println(dt + " is Sunday. ");
            else if(res==6)
                System.out.println(dt + " is Monday. ");
            else
                System.out.println(dt + " is Tuesday. ");
            }
            else
            {
                if(mnth.equals("JAN"))
                    System.out.println(dt + " : Invalid date!!! January has dates from 1 to 31 only ");
                if(mnth.equals("OCT"))
                    System.out.println(dt + " : Invalid date!!! October has dates from 1 to 31 only ");  
            }
               
        }
        // Fetching the day for the month of February or March or November
        else if(mnth.equals("FEB") || mnth.equals("MAR") || mnth.equals("NOV"))
        {
            if((mnth.equals("FEB") && dd1>0 && dd1<=28) || (mnth.equals("MAR") && dd1>0 && dd1<=30) || (mnth.equals("NOV") && dd1>0 && dd1<=30))
            {
            if(res==1)
                System.out.println(dt + " is Saturday. ");
            else if(res==2)
                System.out.println(dt + " is Sunday. ");
            else if(res==3)
                System.out.println(dt + " is Monday. ");
            else if(res==4)
                System.out.println(dt + " is Tuesday. ");
            else if(res==5)
                System.out.println(dt + " is Wednesday. ");
            else if(res==6)
                System.out.println(dt + " is Thursday. ");
            else
                System.out.println(dt + " is Friday. ");
            }
            else
            {
                if(mnth.equals("FEB"))
                    System.out.println(dt + " : Invalid date!!! February has dates from 1 to 28 ");
                if(mnth.equals("MAR"))
                    System.out.println(dt + " : Invalid date!!! March has dates from 1 to 30 ");
                if(mnth.equals("NOV"))
                    System.out.println(dt + " : Invalid date!!! November has dates from 1 to 30 ");
            }
        }
        // Fetching the day for the month of April or July
        else if(mnth.equals("APR") || mnth.equals("JUL"))
        {
            if(dd1>0 && dd1<=30)
            {
            if(res==1)
                System.out.println(dt + " is Tuesday. ");
            else if(res==2)
                System.out.println(dt + " is Wednesday. ");
            else if(res==3)
                System.out.println(dt + " is Thursday. ");
            else if(res==4)
                System.out.println(dt + " is Friday. ");
            else if(res==5)
                System.out.println(dt + " is Saturday. ");
            else if(res==6)
                System.out.println(dt + " is Sunday. ");
            else
                System.out.println(dt + " is Monday. ");
            }
            else
            {
                if(mnth.equals("APR"))
                    System.out.println(dt + " : Invalid date!!! April has dates from 1 to 30 only ");
                if(mnth.equals("JUL"))
                    System.out.println(dt + " : Invalid date!!! July has dates from 1 to 30 only ");  
            }
        }
        // Fetching the day for the month of May
        else if(mnth.equals("MAY"))
        {
            if(dd1>0 && dd1<=31)
            {          
            if(res==1)
                System.out.println(dt + " is Thursday. ");
            else if(res==2)
                System.out.println(dt + " is Friday. ");
            else if(res==3)
                System.out.println(dt + " is Satday. ");
            else if(res==4)
                System.out.println(dt + " is Sunday. ");
            else if(res==5)
                System.out.println(dt + " is Monday. ");
            else if(res==6)
                System.out.println(dt + " is Tuesday. ");
            else
                System.out.println(dt + " is Wednesday. ");
            }
            else
            {
                if(mnth.equals("MAY"))
                    System.out.println(dt + " : Invalid date!!! May has dates from 1 to 31 only ");
            }
        }
        // Fetching the day for the month of June
        else if(mnth.equals("JUN"))
        {
           if(dd1>0 && dd1<=30)
            {
            if(res==1)
                System.out.println(dt + " is Sunday. ");
            else if(res==2)
                System.out.println(dt + " is Monday. ");
            else if(res==3)
                System.out.println(dt + " is Tuesday. ");
            else if(res==4)
                System.out.println(dt + " is Wednesday. ");
            else if(res==5)
                System.out.println(dt + " is Thursday. ");
            else if(res==6)
                System.out.println(dt + " is Friday. ");
            else
                System.out.println(dt + " is Saturday. ");
            }
            else
            {
                if(mnth.equals("JUN"))
                    System.out.println(dt + " : Invalid date!!! June has dates from 1 to 30 only ");
            }
        }
        // Fetching the day for the month of August
        else if(mnth.equals("AUG"))
        {
            if(dd1>0 && dd1<=30)
            {
            if(res==1)
                System.out.println(dt + " is Friday. ");
            else if(res==2)
                System.out.println(dt + " is Saturday. ");
            else if(res==3)
                System.out.println(dt + " is Sunday. ");
            else if(res==4)
                System.out.println(dt + " is Monday. ");
            else if(res==5)
                System.out.println(dt + " is Tuesday. ");
            else if(res==6)
                System.out.println(dt + " is Wednesday. ");
            else
                System.out.println(dt + " is Thursday. ");
            }
            else
            {
                if(mnth.equals("AUG"))
                    System.out.println(dt + " : Invalid date!!! August has dates from 1 to 30 only ");
            }
        }
        // Fetching the day for the month of September or December
        else if(mnth.equals("SEP") || mnth.equals("DEC"))
        {
            if((mnth.equals("SEP") && dd1>0 && dd1<=30) || (mnth.equals("DEC") && dd1>0 && dd1<=31))
            {
            if(res==1)
                System.out.println(dt + " is Monday. ");
            else if(res==2)
                System.out.println(dt + " is Tuesday. ");
            else if(res==3)
                System.out.println(dt + " is Wednesday. ");
            else if(res==4)
                System.out.println(dt + " is Thursday. ");
            else if(res==5)
                System.out.println(dt + " is Friday. ");
            else if(res==6)
                System.out.println(dt + " is Saturday. ");
            else
                System.out.println(dt + " is Sunday. ");
            }
            else
            {
                if(mnth.equals("SEP"))
                    System.out.println(dt + " : Invalid date!!! September has dates from 1 to 30 only ");
                if(mnth.equals("DEC"))
                    System.out.println(dt + " : Invalid date!!! December has dates from 1 to 31 only ");
            }
        }
       
        // Validating month name
        else
            System.out.println(dt + " : Invalid month!!! Enter the correct month ");
    }                           // end of  main
}