C Program to Implement Calender Program to Display Day of the Month

Calender Program in C Programming Language : Display Day of the month :-

Calender Program in C Programming Language :-
Program will accept Year,Month and Date from the user and will display the day of the month

#include<stdio.h>
#include<math.h>

int fmon(int date, int month, int year)
{
   int fmonth, leap;


   if ((year % 100 == 0) && (year % 400 != 0))
      leap = 0;
   else if (year % 4 == 0)
      leap = 1;
   else
      leap = 0;

   fmonth = 3 + (2 - leap) * ((month + 2) / (2 * month))
         + (5 * month + month / 9) / 2;

   fmonth = fmonth % 7;

   return fmonth;
}


int day_of_week(int date, int month, int year) {

   int dayOfWeek;
   int YY = year % 100;
   int century = year / 100;

   printf("Date: %d/%d/%d \n", date, month, year);

   dayOfWeek = 1.25 * YY + fmon(date, month, year) + date - 2 * (century % 4);


   dayOfWeek = dayOfWeek % 7;

   switch (dayOfWeek) {
      case 0:
         printf("weekday = Saturday");
         break;
      case 1:
         printf("weekday = Sunday");
         break;
      case 2:
         printf("weekday = Monday");
         break;
      case 3:
         printf("weekday = Tuesday");
         break;
      case 4:
         printf("weekday = Wednesday");
         break;
      case 5:
         printf("weekday = Thursday");
         break;
      case 6:
         printf("weekday = Friday");
         break;
      default:
         printf("Incorrect data");
   }

}

int main()
 {
   int date, month, year;

   printf("Enter the year \n");
   scanf("%d", &year);

   printf("Enter the month\n ");
   scanf("%d", &month);

   printf("Enter the date\n ");
   scanf("%d", &date);

   day_of_week(date, month, year);
}

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