W3School TIY Editor

#include <iostream>

#include <ctime>  // 导入 ctime 库

using namespace std;

int main() {

  time_t now;

  time_t nextyear;

  struct tm datetime;

​

  now = time(NULL);

  datetime = *localtime(&now);

  datetime.tm_year = datetime.tm_year + 1;

  datetime.tm_mon = 0;

  datetime.tm_mday = 1;

  datetime.tm_hour = 0; datetime.tm_min = 0; datetime.tm_sec = 0;

  datetime.tm_isdst = -1;

  nextyear = mktime(&datetime);

​

  int diff = difftime(nextyear, now);

  cout << diff << " 秒后就是明年";

  return 0;

}