Hm, that's a good question. I guess it really depends on what emulator you're using and whether or not it has RTC support. I'm sure you know a lot more about PSPs than I do so you're on your own with this one. However, I know that the PSP does have a clock so it's most likely possible. If I were you, I would get a Ruby ROM, play until you set the clock, set the game down for fifteen minutes, and then come back and check to see if the clock has changed. That'll tell you if the emulator has RTC support or not.