http://i.imgur.com/kPzTAjX.png?1
http://i.imgur.com/hJH8y5q.png
Those screenshots clearly show the date being the 26th of july, 2013.
And I hardly believe that you don't know how to view skype convos older than a month. When you click on the persons name you will see the option for it, it's rather simple. (not complicated at all)
Btw, if you downloaded a program from i***petual, I can guarantee you that there is a 99.99% chance of it being a RAT or keylogger. In the first place idk why you would want to trust that kid.