Convert tm structure to time_t value: how to use mktime


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

int main ()
{
  time_t rawtime;
  struct tm *timeinfo;
  int year = 2005, month = 2 ,day = 2;
  
  char * weekday[] = { "Sunday", "Monday",
                       "Tuesday", "Wednesday",
                       "Thursday", "Friday", "Saturday"};

  

  /* get current timeinfo and modify it to user's choice */
  time ( &rawtime );
  timeinfo = localtime ( &rawtime );
  timeinfo->tm_year = year - 1900;
  timeinfo->tm_mon = month - 1;
  timeinfo->tm_mday = day;

  /* call mktime: timeinfo->tm_wday will be set */
  mktime ( timeinfo );

  printf ("That day is a %s.\n", weekday[timeinfo->tm_wday]);
  
  return 0;
}

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Convert tm structure to time_t value: how to use mktime : Time Date « Development « C / ANSI-C

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