So if I created a blog-subsite in August 2011, the Monthlyarchive.aspx is going to show me months from August 2011 onwards.
Let's say that I want to create a blog-post now in January 2012 but I want it to say that it was created in June 2011 and I want this to be shown correctly in the Monthlyarchive.aspx. So instead of showing all the months from August 2011 onwards, it would show all the months starting from June 2011. And then when you click on June 2011, it would show the post I created now in January 2012.
How could I accomplish this?