I can have a look in the player log I do have.
Earliest reference of a slovakian "janko" goes back to 2012-09-23 at 7:40. I'm not sure of the time though, there are some chances that the time was not in sync and this might be one day off.
So, if you happen to be this person, this may get a rough estimate of when you installed the game. Hope this helps.
"Chuck Norris had to shorten his beard in the presence of Richard Stallman because two beards that awesome, so close would segfault the universe (again)."