[time] date use pointer struct

#include <stdio.h>
#include<stdlib.h>
#include <time.h>
typedef struct TIME
{
    int t_year;
    int t_mon;
    int t_day;
};
void t_printf(TIME *t)
{
    if(t==NULL)
        return;
    printf("%d/",t->t_year);
    printf("%d/",t->t_mon);
    printf("%d\n", t->t_day);
}
TIME *t_sub(TIME *t2, TIME *t1)
{
    TIME *tmp;
    int m_esp, h_espf, s_esp, m_espf;
    m_esp = h_espf = s_esp = m_espf = 0;

    tmp = (TIME *)malloc(sizeof(TIME));

    if( (t2->t_year < t1->t_year) || (t2->t_year == t1->t_year && t2->t_mon < t1->t_mon) ||
        (t2->t_year == t1->t_year && t2->t_mon == t1->t_mon && t2->t_day < t1->t_day))
        return NULL;
    if(t2->t_mon < t1->t_mon)
    {
        m_esp = 12;
        h_espf = -1;
    }
    if(t2->t_day < t1->t_day)
    {
        s_esp = 30;
        m_espf = -1;
    }
    // not exactly days between 2 date
    tmp->t_year = t2->t_year - t1->t_year + h_espf;
    tmp->t_mon = t2->t_mon - t1->t_mon + m_esp + m_espf;
    tmp->t_day = t2->t_day - t1->t_day + s_esp;

    return tmp;
}
int main ()
{
   time_t rawtime;
   struct tm *info;
   char buffer[80];
   TIME * t_pointer;
   TIME * t_pointer2;
   TIME * t_pointer3;
   t_pointer = (TIME *)malloc(sizeof(TIME));
   t_pointer2 = (TIME *)malloc(sizeof(TIME));
   t_pointer3 = (TIME *)malloc(sizeof(TIME));

   t_pointer2->t_year = 2016;
   t_pointer2->t_mon = 3;
   t_pointer2->t_day = 16;

   time( &rawtime );
   info = localtime( &rawtime );
   t_pointer->t_year = info->tm_year + 1900; // tm_year only use when year since 1900
   t_pointer->t_mon = info->tm_mon + 1; // tm_mon start at 0
   t_pointer->t_day = info->tm_mday;
   //t_printf(t_pointer);

   t_pointer3 = t_sub(t_pointer2, t_pointer);
   t_printf(t_pointer3);

   free(t_pointer);
   free(t_pointer2);
   free(t_pointer3);
   //printf("Current local second: %d\n", info->tm_hour);
   system("pause");
   return(0);
}