Program to find the day of the given date Using C

# include <stdio.h>
# include <conio.h>
void main()
{
int month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int date, mon, year, i, r, s = 0 ;
char week[7][10] ;
clrscr();
strcpy(week[0], "Sunday") ;
strcpy(week[1], "Monday") ;
strcpy(week[2], "Tuesday") ;
strcpy(week[3], "Wednesday") ;
strcpy(week[4], "Thursday") ;
strcpy(week[5], "Friday") ;
strcpy(week[6], "Saturday") ;
printf("Enter a valid date (dd/mm/yyyy) : ") ;
scanf("%d / %d / %d", &date, &mon, &year) ;
if( (year / 4 == 0) && (year % 400 == 0) && (year % 100 != 0) )
month[1] = 29 ;
for(i = 0 ; i < mon - 1 ; i++)
s = s + month[i] ;
s = s + (date + year + (year / 4) - 2) ;
s = s % 7 ;
printf("\nThe day is : %s", week[s]) ;
getch() ;
}


RUN 1 :
~~~~~~~
Enter a valid date (dd/mm/yyyy) : 02/11/1977
The day is : Wednesday