The cheats are nice but yeah the 365 days is annoying. Still cool they finally have been uncovered. I checked them a few days ago with my 700 day bought all the silhouette cars save and it worked the complete event, credits increase, whole license (couldn't do it with my partly progressed Special License one but the sound effect played at least so has to be an empty not attempted License to use it) and individual license one. Doesn't on Tourist Trophy so that's debunked (at least a PAL AU copy anyway).

Then again if someone really wanted they could go into a hex editor or the code or something and alter the day requirement entirely if they wanted to make it 2 days or 1st day/no restriction at all at least in an emulator can't as much for physical already pressed copies of the disk.

Otherwise if you have GT4 Prologue or GT3 isn't one of them kind of redundant and less time then 365 day jumps (don't you get all licenses as bronze similar to GT Concept bonuses applied to GT3 just not the event or the credits benefit ones if I'm remembering correctly.

That or with GT3 the credits transfer. Like you can go to the Status screen from the Garage (licenses, A and B spec points and all that menu) and press Square to do that transfer I know that much I remember doing it years ago and forgetting then remembering.

Sure it requires a whole other game to do them but it's better and less time then 365 days even with jumping in and out of events and you can't change the PS2's clock to change the in-game days as it doesn't work that way).

https://www.gtplanet.net/forum/threads/transferring-licenses-from-gt4-prologue-to-new-gt4.56914/

Transferring Licenses from GT4 Prologue to new GT4GTPlanet