This function is Hardware-specific implementation. It is not implemented in this Compiler.
#include <string.h>
time_t mktime(struct tm *time);
mktime() converts *time to a time_t. The *time fields may have any value and are not restricted to the ranges given in time.h. If the conversion is successful, mktime() restricts the fields of *time to these ranges and also sets the tm_wday and tm_yday fields correctly.
*time as a time_t