c++時間戳轉字符串

unsigned int ts = 1430385936;
std::stringstream ss;
struct tm t;
std::time_t t_t(ts - 8 * 60 * 60);
localtime_s(&t, &t_t);
ss << std::put_time(&t, "%F %T");
std::cout << ss.str() << std::endl;