gift grab 2011 achivment how to get any year

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Step 1.
For step 1 you'll need to change your date and year to EXACTLY December 15th 2011.
Time doesn't matter.
Step 2.
Launch Left 4 Dead 2 and open the Developers Consle by pressing ~
(Right above Tab and under Escape.)
Step 3.
Now Things are starting to get a little harder...
I used Dead Center to get this wonderful Achievement.
So I typed in the Dev. Consle - ss_map1c1_hotel versus
And this started a Versus game on Dead Center Chapter 1 Hotels
Step 4.
Once the map loads type "connect_splitscreen localhost 2" and press enter.
And this should reload the game and when it loads you should have a survivor and an ifected screen!

Now if you are not a survivor repeat this step until player 1 (left screen) is the survivor.
Step 5.
Now grab a fire axe or crowbar and RUSH!!!!
Run through the first map as fast as you can killing ALL Special Infected.
When they drop a present RUN AS FAST AS YOU CAN TOWARDS IT!
If collected you should hear a ding stating you picked it up.
ALSO! You only have a short ammount of time before the game quits because of inactivity from player 2...
Step 6.
If your game crashed or ended all you have to do is repeat Steps 3 through 5 until you get the Achievement!.
Happy Achievement Hunting everyone! ^.^
~S0ul Equinox