Malc - it's just a date and time - example "20090507101010" - YYYYMMDDHHMMSS - year month day hour minute second.
As I explained before, if you put this in, say with today's date and time, then RB will accept it as recent information, and should display the route correctly. If you leave it out, RB will try to look it up and may update it, which you may not want it to do.
As I also said before, this routine isn't working correctly at the moment, so don't expect it to behave like I just described :-)
Hope that helps!
Rod