How to Create Work Dates arithmetic program Tomorrow

Name : Om Chanlyta
Major : TMD

Hello processor these code and video below are show you about how to create work date arithmetic program tomorrow :

#include <stdio.h>
#include <stdlib.h>
int main(){
    struct days
    {
        int day;
        int month;
        int year;
    };
    struct days now,tomorrow;
    int tdate[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
    printf("Input value of day ");
    scanf_s("%d",&now.day);
    printf("\nInput value of month ");
    scanf_s("%d",&now.month);
    printf("\nInput value of year ");
    scanf_s("%d",&now.year);
    if(now.day<tdate[now.month-1])
    {
        tomorrow.day=now.day+1;
        tomorrow.month=now.month;
        tomorrow.year=now.year+1;
    }
    else if (now.month ==12)
    {
        tomorrow.day=1;
        tomorrow.month=1;
        tomorrow.year =now.year + 1;

    }
    else
    {
        tomorrow.day =1;
        tomorrow.month = now.month + 1;
        tomorrow.year = now.year;
    }
    printf("\n tomorrow is day %d month %d year %d \n", tomorrow.day,tomorrow.month,tomorrow.year);
    system("pause");
}

This is my link :
http://www.youtube.com/watch?v=A-dOJmmsT9E&feature=youtu.be