Function mktime () in C

The prototype of the function is written as given below,

time_t mktime (struct tm * Timeptr) ;

The function converts the broken down time representing local time in the structure pointed to by Timeptr into calendar time. In Program the day of the week is determined; it finds the day of the week on 15th August 2010.

Illustrates mktime () function

#include <stdio.h>


#include <time.h>


int main ()


{


  time_t T1;


  char *const wday[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};


  struct tm Time ;


  Time.tm_year = 2010 - 1900;


  Time.tm_mon = 8 - 1;


  Time.tm_hour = 21;


  Time.tm_min = 41;


  Time.tm_sec = 25;


  Time.tm_isdst = -1;


  Time.tm_mday = 15;


  mktime (&Time);


  clrscr();


  printf("The day is %s.\n", wday [Time.tm_wday]);


  printf("%u\n", mktime(&Time));


  time(&T1);


  printf("%u\n", T1);


  return 0;


}