DFI NP900-B16C - Manual (Page 63)

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BIOS Setup
Time (hh:mm:ss) Alarm
This is used to set the time you would like the system to power-on.
If you want the system to power-on everyday as set in the “Date
(of Month) Alarm” field, the time set in this field must be later than
the time of the RTC set in the Standard CMOS Features submenu.