rtcwake

Enter a system sleep state until specified wakeup time relative to your BIOS clock. More information: https://manned.org/rtcwake.

sudo rtcwake -m show -v

sudo rtcwake -m mem -s 10

sudo rtcwake -m disk --date +15min

sudo rtcwake -m freeze --date YYYYMMDDhhmm

sudo rtcwake -m disable

sudo rtcwake -m on --date hh:ss