Dell OptiPlex 755 - Manual (Page 14)

Set PRTC
Enter PRTC in GMT (UTC) format (YYYY:MM:DD:HH:MM:SS). Valid date range is 1/1/2004 – 1/4/2021. Setting PRTC value is used for virtually maintaining PRTC
during power off (G3) state. This configuration is only displayed for the Enterprise Provision Model.
Idle Timeout
Use this setting to define the ME WoL idle timeout. When this timer expires, the ME enters a low-power state. This timeout takes effect only when one of the
ME WoL power policies is selected. Enter the value in minutes.