C++11日期时间显示，跨平台，拼接字符串（精确到毫秒）

#include 
#include 
#include 
#include 
//时间字符串(如：[2022-07-29 18:59:888])
std::string Logger::get_time() const
{
    //转为字符串,跨平台实现
    auto t = std::chrono::system_clock::to_time_t(std::chrono::system_clock::now());
    std::stringstream ss;
    ss << std::put_time(std::localtime(&t), "[%Y-%m-%d %H:%M:%S");
    auto tNow = std::chrono::system_clock::now();
    auto tMilli = std::chrono::duration_cast(tNow.time_since_epoch());
    auto tSeconds = std::chrono::duration_cast(tNow.time_since_epoch());
    auto ms = tMilli - tSeconds;
    ss << "." << std::setfill('0') << std::setw(3) << ms.count() << "]";
    return ss.str();;
}