https://medium.com/jungletronics/struct-union-bit-field-enumeration-in-c-e3af4672a424

EX64.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 = 1;
     dt -> month = 1;
     dt -> year = 2020;
     dt -> status = 1;
     return *dt;
}

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

struct Date date_modify(struct Date *dt, int _day, int _month, int _year)
{

     dt -> _day;    // = 28;
     dt -> _month;  // = 11;
     dt -> _year;   //= 2020;
     // or
     //(*dt)._day;   // = 28;
     //(*dt)._month; // = 11;
     //(*dt)._year;  // = 2020;
     
     if(validate())
         {
            dt -> status = TRUE;
			//(*dt).status = 1;
         } else {
         	dt -> status = FALSE;
            //(*dt).status = 0;
         }  
         return *dt;
}

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);
        //printf("Date:\nDay=%d\nMonth=%d\nYear=%d\nStatus=%d", (*dt).day, (*dt).month, (*dt).year,(*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;
	
}