|Microsoft DirectX 9.0|
The SetClockDelta method adjusts the clock time.
HRESULT SetClockDelta( REFERENCE_TIME rtDelta );
[in] Specifies the amount by which to adjust the clock, as a REFERENCE_TIME value. A positive value moves the clock forward, and a negative value moves the clock backward.
Returns S_OK or an HRESULT error code.
The time values returned by IReferenceClock::GetTime are monotonically increasing. If you set the clock back, GetTime continues to report the old time until the internal clock catches up.