C++获取时间，精确到毫秒

在Windows上可正确运行， Linux上未测试

#include <chrono>

void gettime()
{
	auto now = std::chrono::time_point_cast<std::chrono::milliseconds>(std::chrono::system_clock::now());
	auto millisec = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch());

	auto milli = millisec % 1000; // 秒后3位
	__int64 now_milisecond = millisec.count() / 1000; // 变成秒

	struct tm newtime;
	//__int64 ltime;
	//_time64(&ltime);
	now_milisecond += (__int64)8 * 60 * 60; //此处转化为东八区北京时间，如果是其它时区需要按需求修改
	_gmtime64_s(&newtime, &now_milisecond);
	printf("%4d年%02d月%02d日 %02d:%02d:%02d.%03d\n", newtime.tm_year + 1900, newtime.tm_mon + 1, newtime.tm_mday, newtime.tm_hour, newtime.tm_min, newtime.tm_sec, milli);
}

参考：https://learn.microsoft.com/zh-cn/previous-versions/3stkd9be(v=vs.110)
https://blog.youkuaiyun.com/freeabc/article/details/111669600