How to Shutdown PC with time

Hii friends...
Do you know that you can make your PC shutdown at a time u wish to?
Yes, it is possible with this trick!!

---> Make A Shutdown Timer!

1. Right click on your desktop and choose "New=>shortcuts".
2. In the box that says "Type the location of the shortcut",
   type in "shutdown -s -t 1800" without the quotation marks and click next. Note: 1800 are the amount of seconds before your computer shuts down. So , 60secs*30mins=1800secs.
3. Give a name for the shortcut and you're done.
   You can change the icon by right clicking=>properities=>change icon=>browse

TO STOP:

To stop the shutdown timer just create another shortcut and make the "location of the shortcut" to
" shutdown -a " without the quotes.

Simple..