Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Time
GV_TIME_OPERATOR_OUTPUT_TIMEParameter: Real
GV_TIME_OPERATOR_OUTPUT_REALParameter: Frame
GV_TIME_OPERATOR_OUTPUT_FRAMEParameter: Frames per second
GV_TIME_OPERATOR_OUTPUT_FPSParameter: Start
GV_TIME_OPERATOR_OUTPUT_STARTParameter: End
GV_TIME_OPERATOR_OUTPUT_ENDParameter: Loop start
GV_TIME_OPERATOR_OUTPUT_LOOP_STARTParameter: Loop end
GV_TIME_OPERATOR_OUTPUT_LOOP_ENDParameter: Delta
GV_TIME_OPERATOR_OUTPUT_DELTAParameter: Previous
GV_TIME_OPERATOR_OUTPUT_PREVIOUS