Heh, I'm not doing too well at this, am I. I phased right over the years. I had it in my head that you wanted to do the dates between your first post and your first story (which I know is the ninth, and your cutoff was the 7th, which was confusing, but I keep getting interrupted today, so didn't go back to double check before putting down my answer). So, with that out of the way, I'll switch to:

September 16th, 2011 and February 19th, 2012