Hello!
It's mostly going to be of use for Medical people and Security and their respective log books, but this is how we are counting time here in game.

Month # - Day # - Y #

This year (2008) is Y3. On January 1st we will enter Y4.
So for example, today's date would be 9-29-Y3 or 09-23-Y3

That will help a lot if you keep events dated so that they can be available in files in game later.
Thank you for keeping these guidelines and happy rp : ).