Linux C

#include
#include
int main(void) {
struct tm time_str;
char daybuf[20];
time_str.tm_year = 2001 - 1900;
time_str.tm_mon = 7 - 1;
time_str.tm_mday = 4;
time_str.tm_hour = 0;
time_str.tm_min = 0;
time_str.tm_sec = 1;
time_str.tm_isdst = -1;
if(mktime(&time_str) == -1)
fprintf(stderr, "Unkown -\n");
else
strftime(daybuf, sizeof(daybuf), "%A", &time_str), printf("%s\n", daybuf);
return 0;
}