TLDR
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rtcwake

 
Enter a system sleep state until specified wakeup time relative to your BIOS clock. More information: https://manned.org/rtcwake.
 
  • Show whether an alarm is set or not:
     
    sudo rtcwake -m show -v
     
  • Suspend to RAM and wakeup after 10 seconds:
     
    sudo rtcwake -m mem -s {{10}}
     
  • Suspend to disk (higher power saving) and wakeup 15 minutes later:
     
    sudo rtcwake -m disk --date +{{15}}min
     
  • Freeze the system (more efficient than suspend-to-RAM but version 3.9 or newer of the Linux kernel is required) and wakeup at a given date and time:
     
    sudo rtcwake -m freeze --date {{YYYYMMDDhhmm}}
     
  • Disable a previously set alarm:
     
    sudo rtcwake -m disable
     
  • Perform a dry run to wakeup the computer at a given time. (Press Ctrl + C to abort):
     
    sudo rtcwake -m on --date {{hh:ss}}

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