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; 
 }