Dell OptiPlex 980 (Early 2010) - Manual (Page 49)

Valid date range: 1/1/2004 – 1/4/2021. Setting the PRTC value is used for virtually maintaining PRTC during the power-off
(G3) state.
Type PRTC in GMT (UTC) format (YYYY:MM:DD:HH:MM:SS) and press Enter.
Power Control
Under the Intel ME Platform Configuration menu, select Power Control and press Enter.
The Intel ME Platform Configuration menu changes to the Intel Power Control page.