https://medium.com/jungletronics/data-structure-struct-in-c-caf48ae3c1b2

EX63.c

#include <stdio.h>
#include <stdlib.h>

#define TRUE 1
#define FALSE 0

struct Date
{
     unsigned int day;
     unsigned int month;
     unsigned int year;
     unsigned int status;		
};

struct Date date_init(struct Date dt)
{
     dt.day = 01;
     dt.month = 11;
     dt.year = 2020;
     dt.status = 1;
     return dt;
}

struct Date date_modify(struct Date dt, int day, int month, int year)
{
     
     dt.day = day;
     dt.month = month;
     dt.year = year;
     
     if (validate())
	 {
	 	dt.status = TRUE;
	 } 
	 else
	 {
	 	dt.status = FALSE;
	 }  
	 
     return dt;
}

int validate() 
{
	// Hardware Serial initialization stake goes here!
	return FALSE;
	//return TRUE;
}

void date_print(const struct Date dt)
{
	if(dt.status)
	{
            printf("Date:\nDay=%d\nMonth=%d\nYear=%d\nStatus=%d\n\n", dt.day, dt.month, dt.year,dt.status);
	} 
	else
	{
	    printf("Error: Object initialization Problem:\\\nPlease, Verify your Serial Port of your Iot Hardware.\n");		
	}

}

main()
{
    struct Date clock;
    //UART_Init(9600);
	
    clock = date_init(clock);
    date_print(clock);
     
    clock = date_modify(clock, 28, 11, 2020);    
    //clock.day = 28;
    //clock.month = 11;
    //clock.year = 2020;
    //clock.status = 0;  
	  
    date_print(clock);    
    //printf("Date:\nDay=%d\nMonth=%d\nYear=%d\nStatus=%d", dt.day, dt.month, dt.year,dt.status);
	
    return 0;
	
}