标签：std Code chrono format tm time now clock
std::chrono::system_clock::time_point now = std::chrono::system_clock::now();
std::time_t now_time_t = std::chrono::system_clock::to_time_t(now);
std::tm* now_tm = std::localtime(&now_time_t);
char buffer[128];
strftime(buffer, sizeof(buffer), "%F %T", now_tm);
std::ostringstream ss;
ss.fill('0');
ms = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()) % 1000;
ss << buffer << ":" << ms.count();
// tm : ms
标签：std,
Code,
chrono,
format,
tm,
time,
now,
clock
From： https://www.cnblogs.com/yongchao/p/17759251.html