Those four months

So... Could someone explain to me how the story could move four months forward in time, when the last confirmed date was December 16th 2009, which would be around chapter 36, and the Next date mentioned, which seems to be right after these four months, is March 1st 2010...
That's more like two and a half... *Is very confused*
I guess it's a mistake of some sort, or have I missed something?

My guess is the important thing found 4 months later has not happened "yet" in the story format

I'm in agreement with Grognaurd. We aren't to the thing that Michael mentioned yet. Wonder how many episodes it will take to get to that point.....?