This is to set in a stone where we are in the world. Events in the server and things that you do can progress it forward. These would be story line events along with forced events.
If you have any ideas or complaints reply below with them.
STALKER books have extra info. For example, in september, the UN declared that anyone going into the Zone is officially dead, giving the soldiers the ability to kill any stalker they want to kill. Might be useful for our timeline.