private void TestEm() { const int offset = 3000; int hr; long l, l2; IAMClockAdjust ca = new SystemClock() as IAMClockAdjust; IReferenceClock rc = ca as IReferenceClock; hr = rc.GetTime(out l); DsError.ThrowExceptionForHR(hr); hr = ca.SetClockDelta(offset); DsError.ThrowExceptionForHR(hr); hr = rc.GetTime(out l2); DsError.ThrowExceptionForHR(hr); Debug.Assert(l2 - l >= offset, "SetClockDelta"); }