Time Functions

The ANSI library provides several fun ctions to get the current time. In an embedded systems environment, implementations for these functions cannot be provided because different targets may use different ways to count the time.

clock_t     clock(void);
time_t      time(time_t *time_val);

struct tm * localtime(const time_t *time_val);

time_t      mktime(struct tm *time_rec);

char      * asctime(const struct tm *time_rec);

char        ctime(const time *time_val);

size_t     strftime(char *s, size_t n,

                    const char *format,

                      const struct tm *time_rec);

double      difftime(time_t t1, time_t t2);

struct tm * gmtime(const time_t *time_val);