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Real System Time


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I believe this function will give you the number of seconds since January 1, 1601:

uint64_t SystemTime()
{
	SYSTEMTIME timestamp;
	GetSystemTime(&timestamp);
	FILETIME filetime;
	SystemTimeToFileTime(&timestamp, &filetime);
	uint64_t timetime;
	Assert(sizeof(timetime) == sizeof(filetime));
	memcpy(&timetime, &filetime, sizeof(timetime));
	return timetime / 10000000;
}

Unlike Millisecs(), this function does not change results when the computer restarts, so you can compare values across machines or store them in setting files.

https://docs.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-systemtime

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Quick test seems to work:

int main(int argc, const char* argv[])
{
	auto tm = SystemTime();
	while (true)
	{
		auto newtime = SystemTime();
		if (newtime != tm)
		{
			tm = newtime;
			Print(tm);
		}
		Sleep(1);
	}
	return 0;
}

 

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