Leap Seconds and Drifts: Manual emulation using QPC can suffer from "drift" if the system clock is synchronized via NTP while the QPC continues linearly.
bool Available() const return fn != nullptr; void Get(FILETIME *out) if (fn) fn(out); return; GetInterpolatedFileTime(out); // from earlier code getsystemtimepreciseasfiletime windows 7 patched
Increase the system timer resolution to 1 ms: Leap Seconds and Drifts: Manual emulation using QPC