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/* mktime example: weekday calculator */
#include <stdio.h> /* printf, scanf */
#include <time.h> /* time_t, struct tm, time, mktime */
int main ()
{
time_t rawtime;
struct tm * timeinfo;
int year, month ,day;
const char * weekday[] = { "Sunday", "Monday",
"Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday"};
/* prompt user for date */
printf ("Enter year: "); scanf ("%d",&year);
printf ("Enter month: "); scanf ("%d",&month);
printf ("Enter day: "); scanf ("%d",&day);
/* get current timeinfo and modify it to the 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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