C structure memory research using time

#include <stdio.h> 
#include <time.h>

void dump_time_struct_bytes(struct tm *time_ptr, int size) 
{ int i;
 unsigned char *raw_ptr;
printf("bytes of struct located at 0x%08x\n", time_ptr); raw_ptr = (unsigned char *) time_ptr;
for(i=0; i < size; i++)
{
printf("%02x ", raw_ptr[i]);
if(i%16 == 15) // Print a newline every 16 bytes.
printf("\n"); }
printf("\n"); }

int main() {
long int seconds_since_epoch;
struct tm current_time, *time_ptr;
int hour, minute, second, i, *int_ptr;
seconds_since_epoch = time(0); // Pass time a null pointer as argument. 
printf("time() - seconds since epoch: %ld\n", seconds_since_epoch);
time_ptr = &current_time; // Set time_ptr to the address of // the current_time struct.
localtime_r(&seconds_since_epoch, time_ptr);
// Three different ways to access struct elements: hour = current_time.tm_hour; // Direct access
minute = time_ptr->tm_min; // Access via pointer second = *((int *) time_ptr); // Hacky pointer access

printf("Current time is: %02d:%02d:%02d\n", hour, minute, second); 
dump_time_struct_bytes(time_ptr, sizeof(struct tm));
minute = hour = 0; // Clear out minute and hour. 
int_ptr = (int *) time_ptr;

for(i=0; i < 3; i++) {
printf("int_ptr @ 0x%08x : %d\n", int_ptr, *int_ptr); 
int_ptr++; // Adding 1 to int_ptr adds 4 to the address,
} // since an int is 4 bytes in size. 
}