As someone who completed NOIR years ago -- and may play it again soon -- the walkthroughs don't make it particularly clear how one is supposed to apply the code.
The day code for the door is the day you happen to be playing the game. If you're playing it on Sunday, the code is ---*-. If you're playing it on Monday, the code is *---*. And so on.
NOIR uses your system's date stamp to determine which day it is. Which explains why gamers in the UK can't get NOIR to work -- their systems use a different format for the date stamp.