If the date is 12/25 and you load up your game a "Merry X-mas!!" message will appear.
Set your Saturn's clock to 1/1 and load your game. The Voice Recorder will say Happy New Years
Finish game in Normal Mode, then start a new game in Hard Mode. When you get to Laura's room, press A to see Laura's shower scene.
In Laura's room enter: a,l,c,x and there will be no enemies