PC Shutdown Timer

NOTE: Works on only Windows

Step 1:
Go to Start > Control Panel > System and Security > Administrative Tools and click on the Task Scheduler.(Windows 7 and later)
Hold the "Windows Key" and Add "Q" to get to a search window and type
"Task Scheduler"(Windows 8 and beyond)
 
Step 2:

From the Action menu in Task Scheduler, click "Create Basic Task..."

Step 3:

In the "Create Basic Task Wizard" windows that pops up, Type in a title and a description. Something basic like "PC Shutdown."

Step 4:
Click "Next"

Step 5:

On the "Task Trigger" screen, choose the frequency with which you want the Shutdown PC to run. For nightly shutdown, click on "daily" and click the "Next" button.

Step 6:
On the "Daily" screen, "enter the date and time" you want your PC to shutdown. Click "Next."

Step 7:
On the "Action" screen, choose "Start a program" and click "Next."

Step 8:

On the "Start a Program" screen, type C:\Windows\System32\shutdown.exe in the "Program/script" text field.

 Step 9:

In the Add arguments text field type /s. And Click "Next."

Step 10:

Confirm your settings on the Summary screen and click "Finish."