Trabajar con fechas en C

[razpeitia]

En cualquier compilador decente de C puedes usar:

Código C:

#include <time.h>
#include <stdio.h>
#include <string.h>
 
int main(void)
{
    struct tm start_time;
    struct tm end_time;
 
    memset(&start_time, 0, sizeof(struct tm));
    memset(&end_time, 0, sizeof(struct tm));
 
    strptime("2015-01-18", "%Y-%m-%d", &start_time);
    strptime("2015-01-24", "%Y-%m-%d", &end_time);
 
    double seconds = difftime(mktime(&end_time), mktime(&start_time));
    printf("%.2lf\n", seconds / (3600*24));
 
    return 0;
}