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 mktime()                Convert Time to Calendar Format

 #include   <time.h>                     Required for declarations only

 time_t mktime(my_t);
 struct tm *my_t;       Time to convert

        This function converts the time as stored in a tm structure to
        calendar time (as used by the function time()). If the fields of
        the tm structure are not in their proper ranges, they are
        readjusted.

       Returns:     A time_t structure.

   -------------------------------- Example ---------------------------------

        This example converts 12/25/2000 to calendar time.

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

 int main(void)

    struct tm my_time;
    int year, month, day;

    year = 2000;
    month = 12;
    day = 25;

    my_time.tm_year = year - 1900;
    my_time.tm_mon  = month - 1;
    my_time.tm_mday = day;
    my_time.tm_hour = 0;
    my_time.tm_min  = 0;
    my_time.tm_sec  = 1;
    my_time.tm_isdst = -1;

    mktime(&my_time);   // Convert time.