On Thu, 2023-02-16 at 09:36 +1030, Tim via users wrote:
Many BIOSs will also let you set a wake up time within them. It *may* also be possible for that time to be set from the OS (such as if you wanted to change it).
Remember that the hardware clock may be different from the system clock, running on UTC rather than local time (if it is, it is best left like that). You'd have to work out what UTC time represented your desired wake-up alarm clock time.
Look at the rtcwake command.